As far as I know, places providing the "blue" rate previously are providing the "informal" rate now. The two places I've gone to for the last 5 years or so are still there and still providing. I'd say where, but I don't know their addresses off the top of my head and could only get you close, which isn't good enough because you'd have to know exactly where to go.
Although I haven't been down Florida street in quite some time (at least a year) I'd be shocked if there still aren't people out there changing money and they will be providing a rate based off of the "informal" rate (though about 10 centavos or more off, I'm sure).
Of course, that's assuming you have dollars...