Programmatically add product to cart with price change

Question

I want to add a product to cart programmatically. Also, I want to change the product price when added to cart.

Suppose, my product\'s price is $100. I wanted to cha

Answer 1

If I have to share my solution that I made on the base of Simon then I have managed to rewrite model class save function of quote.

public function save()
{

    $this->getQuote()->getBillingAddress();
    $this->getQuote()->getShippingAddress()->setCollectShippingRates(true);
    $this->getQuote()->collectTotals();
    //$this->getQuote()->save();

    foreach($this->getQuote()->getAllItems() as $item) {             
          $productId = $item->getProductId();
          $product = Mage::getModel('catalog/product')->load($productId);
          if($product->getAttributeText('is_dummy') == 'Yes') {
            $price = 2;
            $item->setCustomPrice($price);
            // we need this since Magento 1.4
            $item->setOriginalCustomPrice($price);
          }
    }  
       $this->getQuote()->save();   
    $this->getCheckoutSession()->setQuoteId($this->getQuote()->getId());
    /**
     * Cart save usually called after chenges with cart items.
     */
    Mage::dispatchEvent('checkout_cart_save_after', array('cart'=>$this));
    return $this;
}