I definitely didn't pay anything for any of mine, just found them in the till over time. Post some that you guys have found, this could be fun. QVC comes to mind.
I think I have a third coin inside this nickel-plated 1960 D penny that clearly fits into a 1994 P hollowed out nickel. Lol. I have yet to figure out why this exists.
Magicians coin Very common You can find many youtube videos on how to make these and find them in relation to magician tricks.