Seatpost Security

I noticed for inner tubes the forum did a bulk purchase. What about the same for these Torx screws?

They only seem to be availible in packs of 100:

http://www.toolfastdirect.co.uk/acatalog/res_machine_Security_Screw_csk_Head.html

You can buy these singly in Clerkenwell screws, but of course now it's been posted on here, at least some of the thieves will start carrying the little kit of bits to undo them. Still it may decrease your chances of it going missing. Also regarding the bulk purchase does anyone know if all seatposts use the same size? My campy Titanium use a 32mm 8M bolt, but I don't know about the others.