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Nitrox is pretty widely available, don't know about the 120s. I would suggest checking with Yucatek. They offer a lot of tech instruction, so they may have equipment others don't. There are no details on their website. They definitely have the nitrox. Here's the contact info:
Av. 15 Norte, entre Calle 2 y 4 Centro
Playa del Carmen, Quintana Roo,
Mexico, C.P. 77710
Phone: ++52 98480 32836
Cell phone: ++52 98487 76026 email@example.com