Most shopping cart solutions are too complicated and too expensive. They take weeks to setup and require computer skills most people don't have. MyShopKart is for people who have no technical skills, want results quickly and have to work on a tight budget. I almost bought SiteBuildIt's E-store recommendation but it cost $700. I trust Ken Evoy's assessments of "quality" but the learning curve is what killed it for me.
Instead I bought Armand Melanson's "MyShopKart" for pennies on the dollar. It starts out up and running with products you can sell and lots of room to add your own products , services, categories etc. It takes all kinds of transactions and suits my e-store monetization needs just fine.
Let me know what works for you.
TVisio's Start Your Own MegaMart