If no cylinder, $1000 is way too much. I paid $1300 last year for a 5 gallon with a perfect cylinder and the pump looked like it had been inside a barn for the past 40 years. It also had the correct cutoff valve, which can get pricey to find the right one. If you're talking rust damage, missing parts, no cylinder, etc DB is correct, $500 is the most I'd go, figuring you're going to be sinking another $750+ just in parts if you want an original cylinder. More if you want the correct cutoff valve (if it's not there).