of the good sheets and matress...
My girlfriend and I make a big mess..., especially when she is on her period. I have a cheap pair of sheets that I would like to put over my regular sheets, but that's not enough. It leaked through last night and made a big funky stain.

I've been looking for rubber sheets that fit a queen size bed, but I can't find any. Any ideas?
I checked froogle and bed bath and beyond and I couldn't find anything related to beds.