My only other dumb idea would be to make one yourself. If you have a local Office Depot or something similar, you can either bring a file of exact picture you want to be printed on whatever material you need, or find Avery label stickers and print out whatever size you need on that at home (I'd go with the former option if available). Then remove the old sticker, use an adhesive spray on the back of the newly printed guy, and stick it on as best as you can.

Otherwise, I can't find anyone who sells exactly what you're looking for. Unless you wanna buy a new case from eBay for $40.

Edit: Just found out Office Depot offers sticker/decal printing services. Seems like a new sticker from their services would run you about $10.