Try a hobby shop - most will have precision screwdriver sets that are very reasonable.
Here in the States, I usually buy small screwdrivers from Sears. Not because they're better than the others, but because they have a lifetime warranty - when i bugger one up, back it goes for exchange.
"If you can control yourself and just loathe us quietly from a distance then by all means stay." - Joe
M6 - Leicavit M - RapidWinder - Motor M
28 Ultron - 35 Summicron ASPH - 40 Summicron - 75 Summarit-M - 75 Color-Heliar - 90 Elmar-C
NEX-7, N1V1, oodles of filthy Nikon SLRs and DSLRs, some OM gear, an XA, Retinas, a 4x5 and a lonely 500C/M