Just from my experience you may want to try a local reef club, but you will take a loss. As an example, I got a 55 gallon AGA for $20 and 2 175 watt metal halide ballasts for $5 each, and the guy threw in a 33 long for me to use as a sump, but it wont fit in my stand so I've gotta figure out do i want to sell it or do I want to try to trade it for a 29 or 20H for my sump, but i doubt that ill get that in trade. I fellow on my reef club has a 180 with black stand and canopy, never had water in it, with sump, skimmer, 3x MH + 4x T5HO lighting, basically turn key system add salt and water, he's asking 750 and speaking with him he'll take 500. Its sad how little our pride's and joy's are worth second hand.