Do your own night dive: Gear up, flag a taxi, go south to the lighthouse, wade out, check that current is heading north, take compass heading to head up the coast, dive in, level off at about 25ft, check your compass frequently, watch for super cool creatures, navigate back while watching for the pier pillars at Hotel Cozumel, find SCC exit point next door, you are home! Easy and fun!
Actually, I suggest doing this dive in twilight first, then the second time at night. It's a fun, easy dive and you'll see plenty of creatures out and about. And the only cost is a taxi shared with your buddy.