My furnace/heat is from a different age - before electronic spark igniters - and uses a thermocouple to detect heat for the pilot light. Bad thermocouple = no pilot = no heat. Just had a younger guy down here from a local heating-a/c company and I don't think he'd ever seen one without an electronic igniter. Anyway he is supposed to be trying to get me a new thermocouple which with labor is gonna end up a couple hundred dollars - but I'll have heat when the freezing temps get here. I got lucky that the pilot made it through last winter before finally giving out completely (I'd been having problem getting it to stay lit for about a year).
The guy (I keep wanting to say kid because he is pretty young) asked if I wanted him to give me a call when they found one to let me know how much it would cost and I told him not to bother, I have to have it done regardless of cost.