I have a poseidon besea 50 for sale. I bought it early this summer and used it in fresh and salt water. Well taken care of. It was used on about 30 dives. It served me well, but I have to part with it because I started an intro to tech course, so now it's back plate and wing for me. I paid $600.00 for it new plus shipping. I will take $400.00 for it plus shipping. If interested PM me for pics. Safe Diving. Al.