Stormin Mormon wrote, on Tue, 23 Dec 2014 14:48:27 -0500:

I'd mention a couple, but you need to be in the trade to buy there.

I called a few today.

My hastily written notes are below, but I may have mixed a bit up
as almost all had to call me back so I invariably didn't have my
paperwork with me when they called back, so, it was hard keeping
them straight since they all sounded the same.

Slakey Brothers 1480 Nicora Avenue, San Jose
(sells only to contractors).

Appliance Parts, Bob 408-265-5030, San Jose
(sells to humans, $18 flame sensor, $250 control board)

APED Appliance, San Jose 408-977-0404
(sells only to contractors)

Residential Heating and AC 888-818-6374, Campbell
(sells to humans, $20 flame sensor, $450 control board)

Air Care Heating & Cooling, San Jose 408-513-3089
(doesn't sell parts, $80 for a service call)

Coldcraft 888-918-8662
(doesn't sell parts, $139 for a service call)