An online source I recommend heartily is www.Fabric.com and they are wonderful to speak with, too. You can pull up their site on your computer and call the 1-800 number and they will walk you right through whatever you need to find there. They have high-quality fabrics at low prices, and shipping on all orders over $35 is free.
I was unable to see the quilt you referred to in your link; it appears to have several different quilts in the photo; maybe I didn't do it quite right? Anyway, I think you've got some pretty good advice already here; keep asking questions and we'll be glad to help however we can!
Odessa