Hi Fuel Drinker
When I needed shims, I got what I needed from my local Triumph dealer, as he had individual shims in increments of 0.02mm instead of Suzuki's 0.05mm, which made life easier, but I have heard that Suzuki are better these days.
The shims were only £4 each, and the dealer was happy to take back any which were not damaged, for a refund, so that was cheaper than buying a box full, which might not have the exact shim required.
Cheers
Crazyhorse