I'll get shot for saying this, but here goes.......
Tupperware!
They make a small round container that fits into the cup holders. As you say, you can still have a small coffee cup sit on top of it as well as another larger coffee in the next hole. I picked one that is dark and leave the coffee cup over it, so if anyone looks it they can't see it either. I guess it could hold around $100 in $2 coins, but I never have that much in it at any time. I do the same in the other car.
Just let your wife think she came up with the idea.
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