If you're going to bring USD/CAD dollars, make absolutely 100% sure they are small denominations. I mean nothing bigger then a 5. Otherwise if you try to pay in larger bills, magically no one has change and if they give you pesos back, you will always get ripped off. I bring a thick wad of single USD's and couple 5s and that's it. I witnessed my friend get ripped off trying to get change for a $100 USD bill and it wasn't pretty.
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