Threadless is offering select T-shirts for $10 - $5 off in cart + $5 shipping = $10 shipped when you "like" their page on Facebook and comment why you like their shirts. Click one of the "shop" buttons when you're done and the discount shows up in your cart (I was able to get the discount by just clicking, without actually doing any of the Facebook stuff). Valid only on T-shirts marked $9.95.