Matamoros is not very far from SPI - maybe 20 minutes I don't know the Boys Town there, but it would be your best bet. Reynosa would be more than an hour away. I don't know if you would really want to drive nearly 2 1/2 hours round trip from SPI to Reynosa. Maybe someone will post something about Matamoros' action. Progreso does not have a Boys Town that I know of, and anyway that would still be about 45 minutes away.If you're looking for a Reynosa guide, I could make it out this weekend.
gogo