Check out the local comic book shops or Card/gaming shops. The Comic boards are VERY inexpensive and come in 3 different sizes. They are also Certified Acid Free. You can get a 100 board pack for about $10.00. They are way thinner that the plastic boards that Alaskasunshine had a tute for and so take up much less room as well. They also keep you from stretching your fabric tight on them thus keeping it square. And remember as an acid free certified product, you won't have any problems with discoloration. Hope this helps. If you can't find them shoot me a PM and I have a few places close to me that carry them.
