Originally Posted by SaylorKennedy
Seconded. In petstores you can get a tank kit for $40 but this usually does not include 'surprise costs' like a heater, gravel, and decorations which will drive your price up to more like 70 or 80.
On craigslist you can easily fish 5g setups with EVERYTHING included for $20 or less. Also most of these tanks are in mint condition and have only been used for a few months because the previous owner did something stupid like put a goldfish in the tank.
Also it sounds morbid but this is the time of year when ill-researched Christmas gifts pass away from lack of care and the parents decide to sell the tank.