There are certain things you shouldn't buy used-- condoms, fuzzy toilet seat covers, handkerchiefs, and enema kits-- but as for everything else, it might be worth it to take the risk and check Craigslist . . . my son Alex asked for a fish tank for his birthday and when you add up the price of the tank and all the gadgets you need, the set-up is pretty expensive, so I took a ride to Avenel and bought a tank from a very nice dude named Sooraj-- and for eighty dollars he gave me everything: 29 gallon tank, hood, filter, heater, pump, gravel, live plants, net, siphon, plastic plants, thermometer, a castle, food, chemicals, and even his fish . . . he dismantled it all in front of me, very methodically, and placed everything into bags and buckets, and then I brought it home, set it up in an hour, and so far the fish survived the trip and water change . . . so my advice is this: at some point in their life, just about everyone has a fish tank, and at some point, just about everyone decides that the last thing they want in their life is a fish tank, so if you want a fish-tank, get a used one.