One-for-one banknote/stamp swap

Here's my deal.

You mail me a banknote, and I will mail you a current American banknote. Nothing fancy or special... an everyday note from your own country is preferred. We can both grow our collections, one banknote at a time.

I think regular first class mail should be adequate, like exchanging Christmas cards. If we also use stamps, our stamps collections can mutually grow, too.

I am in the USA, and don't have any other countries to swap.

If you are interested, send me a PM.

EDIT: My foreign banknotes for swap are gone.