M&M's have been advertising custom M&M's for Valentine's Day. A 7-ounce bag costs $12, and a 1.75-ounce bag with a bow costs $4.
You can print anything you like on them. (Well, I think they might not print some things.)
It's pretty amazing that they can to that level of customization in manufacturing for such a low price. And it's not even done in China!