Up until now I've never thought of this, but those of us who don't do our own valve adjustments should ask for our old shims back when taking the bike to a dealer to get this done. I know I was charged something like $7.xx for each shim they replaced, and they kept the ones they took out. You have every right to ask for the old shims if you're being charged for new ones.
If we get enough people getting their old shims back, we can send them them off to whoever(Pat?), and it wouldn't take long before we'd have a ample supply of every size shim needed. Then Pat, or whoever, could send out the correct size shims to those who need them.