[Astro_Bot]

Not sure what length you want, or if the pitch varies, but online they are around:

http://au.element14.com/schroff/2110...its/dp/2098974

http://www.ebay.com.au/itm/M2-5-STAI...#ht_2561wt_908


Here are a few other possibilities (mostly cap screws):

http://www.amazon.com/M2-5-10mm-Butt.../dp/B003D0BP30 (other lengths at top of page)

http://www.ebay.com.au/sch/i.html?_t...at=0&_from=R40

http://www.wattsuprc.com.au/goods.php?id=1442

http://www.rcworld.com.au/accessorie...x-16mm-10.html