Here's my deals from CL: (Spent about 3 months trolling to get them all. I think they were STEALS)
Old style Tall Glass 150 - Tank only $75
Glass Standard 125 - Tank, 3 Glass Tops and (2) Magnum 350's (Used for polishing only) $75
Glass 220 - Tank, Metal Stand (Not using), Cascade 1000 Filter (Another Backup I guess) $250
3 Rena XP4's on CL for $55 ea.
Building my own stands into the wall during basement renovation so doesn't matter for tank only ones. Stand materials cost about $65 for all three.
Did have to add top cross braces to the 150 and 220 as they are the old style and didn't have any. That only cost about $25.
Picked up two sets of the three glass tops for 72" x 18" tanks on CL for $25. Had to buy extended glass sections to fit the 220 as it's 24". That cost $18 at local glass shop.
So that leaves me at still under $700 before I finished my PVC Overflows, SUMPs, Heaters, etc.
$700 isn't too bad for three large(ish) tanks!!! (Even if they are heavy as all hell)