I keep hearing about Math Trades and they sound interesting. (Actually they sound brilliant and congratulations to whoever thought up that idea in the first place!)
I'm pretty sure I understand how they work... but how does one find a Math trade to sign up for?
Math trades announcement thread: https://boardgamegeek.com/thread/218951/math-trade-announcem...
They are done in geeklists, I've never participated, I agree it's a fantastic idea and way of doing things.