Yes Country Duck it can get very expensive.
I always take a roll of Quarters and a roll of pennies per child. On our last trip, my neice (7) was hooked on collecting them. (they sell pressed pennie collector books at the gift shops with slots for the pennies and a few for the pressed quarters that they have machines for as well.) We ended up filling two books for her and she loves them. (She takes her books out and shows everyone!)
At $.51 a pop for the pennies and $1.25 a pop for the quarters the collection can get pricy if you don't set aside the change before hand.
- lori