Back to Old School sale, t-shirts for $10 and hoodies for $30.
Be careful with import duty.
Previous deal says "You can buy 2 t-shirts and be under the customs limit."
That was last month so I'm not 100% sure if that is still accurate, but it should be.
At the current exchange rate it works out at £6.38 per t-shirt plus postage.
First deal so be gentle :P