Got these stickers at the Bethesda Borders on Saturday night. I found out later that there's quite an online hubbub about them, as you're supposed to get one free by preordering Harry Potter and the Deathly Hallows. There was just two stacks of them on the info counter, though, so I assumed they were gratis.
Fun stuff. Snape's sure to wind up a good guy, but I like the promotion nonetheless. Of course, I'd never buy the Americanized version of HPatDH. I want my English heroes complete with intact Briticisms, so I preordered this one from Amazon.co.uk.