It has been a year ago since I bought an aquarium from PetSmart. It is a 20 Gal. long and it was advertised as a reptile aquarium kit. It came with a light bulb, thermometer and locking lid and some other extras and was $59.99. If you can, you can save money buy shopping at PetSmart, PetCo, Wal-Mart. You can even use Rubber-Maid product and I'm sure someother member's could help you out with that better than I can.
Good Luck.