We have eCart Express integrated... it is a better solution than standard. Still free but don't require IPN. eCart 6 will allow you to re-do your checkout using this more modern solution.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.