I found a decent ecommerce software package called Interspire Shopping Cart. I went through the demo and it is very good for $300 Starter edition. I don’t think the $995 or $1995 editions are worth the money for the extra features. Take a look if you are looking for a cheap decent cart solution.
My friend Chris at custom car stickers sent me an email today about another cart system that is free. It’s based on Joomla with a Virtuemart plugin. This system is pretty good also. It doesn’t have the one page simple checkout like the Interspire.
I feel that either of these systems are the cheapest way to begin an ecommerce store right now. If you just use paypal and Virtuemart, you can start your online store for free.