The client bought a template made for Zencart but didn't want the 3 page checkout process of Zen so they got a service from 1shopping cart which offers single page checkout without registration.

They wanted the site to look like a store and be able to make changes when needed without relying on a webmaster so we created a theme from the template they bought.

It uses WFChannel to display the products and copies of easypage for other pages.

http://naturalrxstore.com

try to use Kshop and you can install/uninstall checkout as plugins
http://www.kaotik.biz/