Keepsake quilting has wide backs, online.

I just bought 108" backing from joanns today, is there another in your area you can call?

fabric.com is where i get about 95% of my wide backs- good selection, good prices & free shipping at the $35 level.

Craft Town Fabrics has a wonderful selection of backings and GREAT service!!

darn i was going to say fabric .com too they have an awesome selection but keepsake quilting has some too and theyre fabric has always been top notch so you couldnt go wrong with either place. good luck in your search and let us know how it goes.
carla m

Christianlanequilters carry Fat Backs but they say they are for Queen size. 3 yds with four extra inches I think.

Thank you all very much. I'll check out all your suggestions!!! :)

Connecting Threads has wide backing fabric now.

Fabric Hut has a lot of wide backing fabrics. Fabrichut.com. I love shopping there and they will ship. :-)

Sew Batik has great fabric. Just read the instructions. They recommend washing with Synthrapol before use because to remove wax and excess dye.