Thanks for putting this list together everyone! Just adding my experiences below...
Lizzard Lick is dead... Should have seen the end coming when every item went pre-order only status. Such a shame, they were really good at one time.
Twisted Quarter has a nice ebay shop with fair prices, I've never been disappointed. Ordered many Happ parts for my woodies, more USA parts however.
I just placed my first order with Giz10p for coin entry's, fast shipping to USA. The down side is minimum order amount (I ordered 3 parts when I only need 1).
Focus Attack has become my new goto source for Sanwa parts, good selection at fair prices.
Jammaboards makes high quality PCB's with lots of options including CPS2 kick harnesses. Fast shipping and cheap prices!
The Gameroom (Ken) is a joy to deal with! Quick to answer all my questions, proper packing/shipping of my Blast City, reasonable prices.