Best deal I have ever gotten related to aquatics is one nobody else will have, as it's one of a kind.
It's my wonderful wife, who tolerates 18+ tanks, trials & tribulations of breeding and selling, auctions, me waking up at 4:30 am for auctions, brokers coming over at the drop of a hat to buy fish, numerous club related meetings and activities, tagging along with me in a beat up pickup truck through some of the nastiest areas of Chicago to get free tanks & gear, and after all this takes over the position of club secretary, a real pain in the butt position that no one wants to do, but must be done. There are probably a dozen other situations I’m forgetting; how she tolerates me I’ll never know.
Next best deal would be a 72-gallon bow front, with stand, glass top, light, and 15 plec for free.