Secondhand tanks are the way to go, IMO. As long as you are relatively handy, a leaking tank can be an exceptional bargain as long as no pieces of glass are cracked or broken. I got a great deal on a 75 gallon tank, stand and hood this way and fixed the leak (the seller told me about it up front). I posted
here about how I did this.
In any event, I would suggest disinfecting (you could use bleach if you wanted to, but probably not needed) and air-drying as Purple said. Then fill the tank outside either on its stand or on a
flat surface and check for leaks before bringing it inside.
Good luck and happy hunting