ADVENTURERS!: Level 1: World of Imbalance - ORDER NOW

This would be perfect for redemption codes, but such codes are only viable for sealed products. Or books ordered over the internet, like the Keenspot ones are, thinking about it. Just so long as the guy in Shipping isn't an unscrupulous CMC fanatic/troll.
Or for sendaways where you post a last/middle page tearout, insert, and/or receipt to an address (ie webrunner) in exchange for the redemtpion code? This would be a heck of a lot of hassle though.

I'll need to look at Keenspot's postage fees to the UK.