The name "Leather Guy" tells you what they sell: things made of leather. It's a great online leather shop with a wide selection of leathers and tools. This is one of the best-kept leather secrets.
Cricut also sells supplies that will definitely work with their machine. Even though they are a bit pricey, they almost always promise that their blanks will work with their machines.
I hope you were able to find some great places to get blanks for earrings made of fake leather.Some are hard to find, especially if you don't want to buy a lot.