Assault Publishing is having a special sale on their PMC 2640 rulebook over on their website.
From the sales sheet:
In June 1997 Blackwater USA, the most famous modern mercenary company (today known as Akademi), was formed by Al Clark and Erik Prince in North Carolina.
Now, you establishing your own PMC of far future even easier! From today, untill the end of June 2014, you can get PMC 2640 printed rulebook in the price of pdf version! When placing the order in Assault Publishing webstore type BLACKWATER code to get this special discount!