1991 Mercury Capri XR2

Does anyone know where I can get an oil pressure sender/switch for a 1991 Mercury Capri XR2, or one that would work other than the OEM? I have found them new but the place wants $500 for a pressure sender claiming that that was Ford's last list price for them (when in actuality the last list price for the sender was $19) Any help would be greatly appreciated.