OptionCart is inexpensive, works quite well and as open source software has a LOT of potential for customization (all written in PHP using a MySQL database).
But what really sets them apart is their outstanding tech support. Susan and Sherri have sent me many lines of custom code to accomplish some pretty demanding requests from clients… They are always exceptionally helpful, timely and polite and go way beyond the call of duty.Â No other company I’ve dealt with as a web designer even comes close.
If you’re a user of Mal’s cart system (which I also highly recommend) and need more functionality for your clients, really consider checking out OptionCart. They offer a reseller program for web designers and developers too.