Used stamps exchanges.
You send 50 used stamps
to a random member
and you receive 50 back!
50stamps.club is a mail-based exchange club for collectors of used postage stamps. Each exchange involves 50 different stamps in good condition, sent to a randomly assigned member with an exchange ID. After the recipient registers the lot, the sender can receive 50 used stamps from another collector. The smaller lot size makes it easy to share stamps and explore collections from other countries.