16726 PHP, Ajax shopping cart

Looking for a good quote on developing a shopping cart that is a mirror of [login to view URL], the script is already out there and free (opensource - [login to view URL]) with a demo. The biggest part I need is the integration with a shopping cart that I can easily use to upload new products to and have update the inventory accordingly, along with includes that will populate the new products dynamically to the webpages the script is on. So all in all, just like [login to view URL], in there source they use dynacart. But I am open to alternatives. Thanks :)