Wow, thanks for all the great info everyone! It looks like there are a ton of options out there and the Boss RC-50 seems like a fave. My son actually has a collection of flattened pennies so maybe I'll sneak in there to "borrow" one, kinda like the tooth fairy's evil twin.
Btw, what's it mean to put a loop in reverse? Sort of reminds me of how we used to play albums backwards looking for the secret messages...