I'll be in work in about an hour and post when I get home (12.30~1.00am)
I haven't bought shims for a few years but $20.00 each seems real excessive (last ones I bought, in Britain, were 85 pence, about $1.70)
Maybe the sintered ones for RMZ/GSXR with titanium valves are more expensive but I think your motor has steel valves, its to old for Ti.
PJ