I guess I wasn't reading the auction closely enough, and I bought a cricut cake cartridge. I don't have a cricut cake, it is one of the regular ones. Can I still use this cartridge? I don't want to open the package until I'm sure, because I could resell it on ebay if not.

Cricut Cake cartridges are compatible with regular Cricut machines, and vice versa.

Awesome, thanks!