Found the bookstore through this post:
https://www.mobileread.com/forums/showthread.php?t=60761
It turns out that when you sign up, they give you a 20% off coupon for your first order. I assume the code will be the same for anyone signing up -- it's welcome. Be aware that their prices are higher than most other places, however of six books I picked out that I was interested in, only two were still more expensive after the discount and not by much. Check with Inkmesh to make sure though. Just take the price they offer and multiply by .8 to find the actual cost.
Here's the link for the web site:
http://www.rainbowebooks.com/store/
Eric