Craigslist can be a dangerous place.... I have the app on my phone, and as soon as something new gets listed that I have searched for.... I get a beep.
So far I have gotten a2.5, 5, 20, 55 with stand, and 125 with stand from craigslist all for about $400
One day I bought a light fixture with 3 halides and 2 4' t8s with remote balasts and extra bulbs, 2 150gal rated Eheim canisters, an aquaclear 70 New in the box, a power head, some rocks and an auto feeder..... all for $210.
For some reason.... my wife checks to see if I have any cash before I leave the house on errands now