The erecaid and Vacuret pumps are very expensive $250 to over $400. I bought an Encore Revive manual pump on line for $79. It seems to work just like the more expensive models. I avoided the battery operated pumjp, because I wanted to control the rate of suction.
Some medical plans will pay a small amount towards purchase if you have a doctors Rx.
I bought from a dealer for Encore Medical.