Oh, how fun - and what a nice SIL!!!
He's franks11 on eBay - and he's always a FABULOUS source of assortments of FQ's and yards.
You can call them direct from the number on their auctions and ask if they have 40 Civil War prints or 25 30's repro prints or whatever and whatever you want, he'll ship it to you. Usually the same day or the next day.
I've bought assortments of CW, 30's, Jinny Beyer, Debbie Mumm, black and white prints and white on white prints, plus yardage in muslin, percale, linen weave white cotton, black cotton, white on white prints. Really outstanding seller.