I have gotten parts from Bill's Boneyard and Rick's Cycle parts they both had lots of old bikes (at least they did quite a few years ago). I would have to look up the addresses.
When I was a teenager I used to be my mom and older brothers to drag me out to Bill's & Rick's to get parts for my bikes, I was like a kid in a candy store I know Rick's went internet only for a bit, not sure if its still the same? Have not heard much either way about Bill's in years.