I have a collection of silver dollars.

I exchanged my dollars for rix-dollars.

I have a collection of half-dollars.

I exchanged my euros for US dollars.

They paid top dollars for that rare collectible.

I exchanged my US dollars for Singapore dollars at the bank.

I exchanged my US dollars for Canadian dollars at the bank.

I found several sand dollars on the beach.

He exchanged his euros for U.S. dollars.

I exchanged my US dollars for Australian dollars at the bank.