I am reviewing the Avactis shopping cart today. The company is based in NY and according to the company, they have over 10,000 users. It is a php and mysql driven solution. It has been optimized for performance and flexibility for its ability to easily integrated into existing stores. They have both license and hosted base versions. If you want it hosted, then it is $19.95 per month. If you prefer to buy the license, it is a reasonable one-time fee of $199. A web developer can receive a free copy and receive a substantial discount on all future copies. This is great for web designers that want to use this product on their customer’s sites. They even have a reseller version that can be re-branded. This runs just under $300. Another great benefit is they even have a free open source version of the cart! It does lack some features, but definitely something to look into.
One of their strengths is the merchant can have one admin area for multiple stores, including the free version. You can also have unlimited products & categories. It is also compatible with mostproviders. Its biggest drawback is their lack of partners & affiliates.