Once again, local clubs. You will find out about breeders upgrading and selling off tanks, as well as auctions. Best deal I've gotten was a 30 gallon for $3. I gave that away a while back when I did some upgrades. Too bad you aren't local, I know a guy with thirty or so 40 breeders, $25 each, already drilled with overflows. I talked him into five for $100, I'd better get them out of the garage soon, my wife would like to be able to park her car in there.