Jaba, if you use fat quarters, even if you sign up for 5 sets, you won't be able to keep one. You have to buy more fabric than a fat quarter in order to keep one. I wasn't thinking about it very clearly and that's what I did too. :-)
Happylab, does your fabric have words on a selvedge? Sometimes you can look up online if it's considered a 30's reproduction by using the info printed on the selvedge.