Shopping Cart with Meta Tags for Facebook Like Plugin

I need to install a new shopping cart for a client but with a catch. Each item is to have it’s own like button. Sounds simple enough, but I need to make each like button have their own image. The only way I know how to do this is by setting a unique meta tag for each product, but I can’t find a cart that will let me do this!

For example, I need to add this tag to the header of each product page individually so I can change the file locations:
<meta property=”og:image” content=”/images/picture.jpg”/>

With the standard WP-Ecommerce plugin it has a field for Advanced Settings > Meta Tags but only gives a NAME and DESCRIPTION field to help search engines find the products and does not allow custom meta tags.

PLEASE HELP ASAP!!!!! THANKS!