Yeah, I was thinkin the same thing Jo was. Yard sales are great places to get cheap tanks. However, the PETCO dollar a gallon thing is a good deal if you're gonna go big. Plus, if you decide later that you want to put fish in, it would have been a brand new tank already, so you shouldn't have to worry about leaks. At an expo you can find good deals on tanks, but I couldn't imagine having to cart that thing through crowds of people - geesh!