Where can I buy an Igniter for my boiler?

Noone in Lowes or Home Depot seem to know what they are talking about. I'm in Rhode Island and am looking to find out where I can buy an igniter for my boiler-I believe that is the problem I'm having but being a Sunday it's not easy to get intouch with people. Thanks to Fraz on here who gave me enough to check and isolate that we think it is that. Now-just trying to find out where to get the igniter so that I may be able to get heat in my house. 57 inside, 26 outside....dont have the $ to hire a service tech to come in blind, spend 3 hours @ $110/hr looking only to spend hundreds more on parts that may or may not fix it. I'd like to try to fix this ourselves. If you know anything about this or where to get one, please answer.