Martin - I go to Pacific Arborist in North Van. If the parts are still available they'll order them in for me and if not, it's off to eBay etc. I try to make it painless for them by telling them the P/N I need rather than have them look it up.
It also helps to learn which other saws share common parts to yours. I recently needed a Woodruff key for my flywheel but they're no longer available. Form this forum I learned that the ignition and flywheel from a 2100 can be used on a 480 so I figured the key may be the same. PA had an old 480 in the back and when I tore it down, sure enough, they key was the same.
What is it you're looking for?
Nikko