I see different types of pumps at home depot and etc, all depends what part of the brew you are going to use it for, if it touched wart i have read that it must be SS, but nonw of the ones that i see at the hardware stores are like that.
Island Time Brewery
Black Caesar Imperial Stout by Island Time Brewery
Islamorada Pale Ale by Island Time Brewery
Stainless is Painless