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This came via email from Betterworld. Their Bargain Bin is back with a wide selection of used books available and cheap international delivery.
Buy five used books from the Bargain Bin category on BetterWorld.com for only US$15. International shipping is only US$3.97. Your purchase will fund literacy around the world. Discount will automatically be applied at checkout.
Seems like there's some pretty good books on offer here (and some really bad ones!). Never had a problem with Betterworld though their cheapest shipping can be pretty slow (about two to three weeks).