We used citymax shopping cart to sell products onlines. Although it was going okay in the beginning but after a while I started facing problems.First was that it did not allow to build the site locally that meant that we had to go online for every minor change we had to make in the site. They also did not differ between development and release page so the page is live online. We switched because we also didn't like the $20 per month fee. Try to stick with the carts that have a one time install fee.