Search for "Bosch Relay". The generic 30-40 amp relays are going for an average of $2.00 apiece, with the 4 or 5-wire plugs included. I've been using them for years, and the brand name isn't particularly important.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!