Sounds cool and all, but unlikely... whenever I can get a pair of falsies, I'm keeping 'em until they fall apart.
Wigs, that'd make sense. Or if someone has a costume, costume parts, clothing, etc. that doesn't fit anymore, or they don't use anymore. Then all would be good.
But please... no used gaffes, panties, and binding materials seem a bit iffy too... at least wash them first!