scubajim
Contributor
ntBrettM:There is a small shop named Cozumel Scuba Repair that generally has some very good deals on used equipment. The owner of the shop services equipment for many of the local dive operators and is very reputable. He may not always have a large selection of equipment but he goes over all the equipment to be sure it is in top working condition. You may even be able to arrange with him to actually dive with the equipment to try before you buy. Some of the equipment is cosmetically used but he replaces and tunes all the functional parts as needed so if you don't mind a few scuffs you can get a great deal.
http://www.islacozumel.net/services/repairs/