Output of this below code..














Create a Gts_Oos.xml file in app/etc/modules/

<config>
    <modules>
        <Gts_Oos>
            <active>true</active>
            <codePool>local</codePool>
        </Gts_Oos>
    </modules>
</config>

Create a folder on app/code/local/Gts/Oos/
Create a folder on app/code/local/Gts/Oos/etc/

Create a config.xml file inside etc/config.xml folder
and put that below code on this file.

<?xml version="1.0"?>
<config>
    <modules>
        <Gts_Oos>
            <version>1.0</version>
        </Gts_Oos>
    </modules>
               
    <global>
        <blocks>
            <catalog>
                <rewrite>
                    <product_view_type_configurable>Gts_Oos_Block_Configurable</product_view_type_configurable>
                </rewrite>
            </catalog>
        </blocks>
    </global>
</config>

Create a folder on app/code/local/Gts/Oos/Block/

Create a Configurable.php file inside Block/Configurable.php folder
and put that below code on this file.

<?php
 
class Gts_Oos_Block_Configurable extends Mage_Catalog_Block_Product_View_Type_Configurable
{   
	public function getAllowProducts()
	{
		if (!$this->hasAllowProducts()) {
						$products = array();
						$allProducts = $this->getProduct()->getTypeInstance(true)
										->getUsedProducts(null, $this->getProduct());
						$this->setAllowProducts($allProducts);
		}
		return $this->getData('allow_products');
		
	}
		
	/**
	 * Composes configuration for js
	 *
	 * @return string
	 */
    public function getJsonConfig()
    {
 		$attributes = array();
        $options    = array();
        $store      = $this->getCurrentStore();
        $taxHelper  = Mage::helper('tax');
        $currentProduct = $this->getProduct();
 
        $preconfiguredFlag = $currentProduct->hasPreconfiguredValues();
        if ($preconfiguredFlag) {
            $preconfiguredValues = $currentProduct->getPreconfiguredValues();
            $defaultValues       = array();
        }
 
        foreach ($this->getAllowProducts() as $product) {
            $productId  = $product->getId();
			
			foreach ($this->getAllowAttributes() as $attribute) {
				$productAttribute = $attribute->getProductAttribute();
				$attributeValue = $product->getData($productAttribute->getAttributeCode());
				
				$options['qty'][$product -> getAttributeText($productAttribute->getName())] = floor($product->getStockItem()->getQty());
				
				if (!isset($options[$productAttribute->getId()])) {
				$options[$productAttribute->getId()] = array();
				}
			   
				if (!isset($options[$productAttribute->getId()][$attributeValue])) {
				$options[$productAttribute->getId()][$attributeValue] = array();
				}
				$options[$productAttribute->getId()][$attributeValue][] = $productId;
				}
        }
 
        $this->_resPrices = array(
            $this->_preparePrice($currentProduct->getFinalPrice())
        );
 
        foreach ($this->getAllowAttributes() as $attribute) {
            $productAttribute = $attribute->getProductAttribute();
            $attributeId = $productAttribute->getId();
            $info = array(
               'id'        => $productAttribute->getId(),
               'code'      => $productAttribute->getAttributeCode(),
               'label'     => $attribute->getLabel(),
               'options'   => array()
            );
 
            $optionPrices = array();
            $prices = $attribute->getPrices();
            if (is_array($prices)) {
                foreach ($prices as $value) {
                    if(!$this->_validateAttributeValue($attributeId, $value, $options)) {
                        continue;
                    }
                    $currentProduct->setConfigurablePrice($this->_preparePrice($value['pricing_value'], $value['is_percent']));
                    Mage::dispatchEvent(
                        'catalog_product_type_configurable_price',
                        array('product' => $currentProduct)
                    );
                    $configurablePrice = $currentProduct->getConfigurablePrice();
                    $qty='';
                    $qty = $options['qty'][$value['label']];
					$info['options'][] = array(
					'id' => $value['value_index'],
					'label' => ($options['qty'][$value['label']] <= 0) ? $value['label'] . ' (Out Of Stock)' : $value['label']. '('.$qty.') In Stock',
					'price' => $configurablePrice,
					'oldPrice'  => $this->_preparePrice($value['pricing_value'], $value['is_percent']),
					'products' => isset($options[$attributeId][$value['value_index']]) ? $options[$attributeId][$value['value_index']] : array(),);                                                                               
                    $optionPrices[] = $configurablePrice;
									
					
                }
            }
            /**
             * Prepare formated values for options choose
             */
            foreach ($optionPrices as $optionPrice) {
                foreach ($optionPrices as $additional) {
                    $this->_preparePrice(abs($additional-$optionPrice));
                }
            }
            if($this->_validateAttributeInfo($info)) {
               $attributes[$attributeId] = $info;
            }
 
            // Add attribute default value (if set)
            if ($preconfiguredFlag) {
                $configValue = $preconfiguredValues->getData('super_attribute/' . $attributeId);
                if ($configValue) {
                    $defaultValues[$attributeId] = $configValue;
                }
            }
        }
 
        $taxCalculation = Mage::getSingleton('tax/calculation');
        if (!$taxCalculation->getCustomer() && Mage::registry('current_customer')) {
            $taxCalculation->setCustomer(Mage::registry('current_customer'));
        }
 
        $_request = $taxCalculation->getRateRequest(false, false, false);
        $_request->setProductClassId($currentProduct->getTaxClassId());
        $defaultTax = $taxCalculation->getRate($_request);
 
        $_request = $taxCalculation->getRateRequest();
        $_request->setProductClassId($currentProduct->getTaxClassId());
        $currentTax = $taxCalculation->getRate($_request);
 
        $taxConfig = array(
            'includeTax'        => $taxHelper->priceIncludesTax(),
            'showIncludeTax'    => $taxHelper->displayPriceIncludingTax(),
            'showBothPrices'    => $taxHelper->displayBothPrices(),
            'defaultTax'        => $defaultTax,
            'currentTax'        => $currentTax,
            'inclTaxTitle'      => Mage::helper('catalog')->__('Incl. Tax')
        );
 
        $config = array(
            'attributes'        => $attributes,
            'template'          => str_replace('%s', '#{price}', $store->getCurrentCurrency()->getOutputFormat()),
//            'prices'          => $this->_prices,
            'basePrice'         => $this->_registerJsPrice($this->_convertPrice($currentProduct->getFinalPrice())),
            'oldPrice'          => $this->_registerJsPrice($this->_convertPrice($currentProduct->getPrice())),
            'productId'         => $currentProduct->getId(),
            'chooseText'        => Mage::helper('catalog')->__('Choose an Option...'),
            'taxConfig'         => $taxConfig
        );
 
        if ($preconfiguredFlag && !empty($defaultValues)) {
            $config['defaultValues'] = $defaultValues;
        }
 
        $config = array_merge($config, $this->_getAdditionalConfig());
 
        return Mage::helper('core')->jsonEncode($config);
    }
	
}
?>

Please clear your magento cache through Admin.