Looking for a cheap used wetsuit

I am training for my first sprint tri in August and am looking for a cheap used wetsuit so that I can start to do some open water training. I don't want to spend a lot since (1) I'm not sure yet if I will stick with this in years to come and (2) I'm working on losing a significant amount of weight (~20 pounds) and will hopefully need a smaller wetsuit by the end of the season. I've looked around and there seem to be several different sizing systems, so I don't know what size I would be. I am 5' 9", 195lbs. So if you have a old wetsuit that you want to get rid of, drop me an email at [email protected].
Thanks in advance,
Cesar