I love 1ShoppingCart. However, without more information, I can't tell if that's the right solution for your client. They're fantastic, with quick an helpful support.
There's also dreamweaver plugin that's helpful for ecommerce sites: DataAssist (
http://www.webassist.com/professiona...ls.asp?PID=117) makes a catalogue site without having to code.
HTH,
Erin