I just got home from a FART (Fabric Acquisition Road Trip) up through Oregon and back and I bought several white-on-white and white-on-cream prints when I saw good ones because I have trouble finding them locally too. Joann's carries them but I think all of theirs are too thin, and I don't like buying whites online because I want to put my hand behind them and see how thin they are.
I probably bought 8 or 9 yards of wow/woc fabrics on my trip so my stash is happier now!