This seems to be a US-only thing for MicroCenter. if anything like this is happening near you, post it in here to share.
This might have something to do with the fact they sold over x amount of boards since 2012, and it's a special promotion, least that's what the woman at check-out said to me yesterday when I purchased mine.
Remember to get the cheapest USB-OTG to normal USB adapter you can get your hands on to use the thing properly, though, since it doesn't have networking or WiFi on-board. Still, for US$1, you can't go wrong for some cheap fun.