Sorry was there in Jan and Feb.
There were two or three....two were on the main street...both on corners... and there was one on middle street. Don't remember what they were called. They seemed to be established businesses not back street operations. These were NOT black market operations.
The Banks MIGHT even give a better exchange rate than the stores..
I'm not talking big differences...BZ$203 for US$100. BUT for US$ 10,000 it makes a difference and you eliminate the credit card fees.