I got my comic boards at Amazon. Just do a search for "comic boards" with a lot of choices, I get the ones that are 8.5 X 11 without bags, they are the right size for my shelves and when the fabric is folded it fits perfectly. I am blessed with a large walk in closet and placed closetmaid shelving in it floor to ceiling. As it is currently pretty full, I am on a "fabric restriction" and only buy what I need to use that stash up.
My problem now is what to do with fat quarters. They are currently folded and in Artbin containers kinda sorted by color but not really and are a pain to access and use. How do you store and organize fat quarters?