I would feel good about buying used, but only from Woody or qualityporscheparts. Clean the new-used switch with contact cleaner and it should last a while. If you really want it to last, add a relay so that the full current isn't flowing through the switch. Relays are much, much cheaper to replace.
Take the power out wire from the switch, cut it, then use it to power the relay. If you decide to go this route, I'll mspaint you a diagram.