If you go to guest relations at each park, they can give you a guide that has all the locations. Don't forget resorts also have them too.
Another tip for pressed pennies: use an empty film canister to store your quarters & pennies. Put them in 2 qtrs, 1 penny, 2 qtrs, 1 penny, etc - that way when you need it, you won't be digging thru your whole stash to get the right amount.
Don't forget there's also pressed quarters. These are $1.25 - 4 qtrs and 1 to press.
You can buy a book to hold them at the gift shops. I believe they're about $6.