My best find was a 20g long tank, mesh lid, florescent light (2 compact bulbs and 18" bulb), humidity/temp gauges, drift wood, and 4 bowls all for $20. It was a set up for a snake but over the years I have found a use for everything.
I also will look at every plastic container that comes thru our house to see if I can use it for a food or water bowl, calcium dish, or hide. You would be amazed how many lids will work for those things and people throw them out. If its safe enough for people food should be just find for the reptiles after a god cleaning.