any scott pack (firefighter air) power tank, or even scuba tank will hold around 3000psi, all you need is the regulator... usally these can be found cheap, just pay attention to the hydro-test date, they are only good for 3 years.
i knowthe same guy, not to steal your thunder donny,he said as long as they were within thier periodisity/hydro, there would be no issues.P.S. an as long as they had the right fittings