Hi Brad,
I think the paint is a standard Nato colour and as such they should be available to you to have mixed up at you're local paint supplier.
Clive Elliott has written three good articles on the subject (covers markings as well).
http://www.hmvf.co.uk/pdf/PAINTINGpart1.pdf
http://www.hmvf.co.uk/pdf/PAINTINGpart2.pdf
http://www.hmvf.co.uk/pdf/PAINTINGpart3.pdf
I have used Marcus Glenns Nato green paint and it requires a very good stir (the same as any paint) but if you don't stir long enough it dries eventually as a semi gloss. Which is annoying, you only do that once!
I'll include the standard ebay item here as well (have not used plan to buy some).
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120558949595&ssPageName=STRK:MEWAX:IT#ht_1267wt_911