So standard 5.56mm ball is just $0.55 a round in a street bazaar in Iraq! Don't bother sending care packages to your buddies stationed over there. Ask them to send you ammo packages instead!
Calibre Obscura has a number of interesting tweets on his Web page and his Twitter channel. (The latter informs us, for example, that used full-auto military-issue M16's can be had in Iraqi street markets for $1.8K to $2.1K, depending on manufacturer.) I learned quite a lot from scrolling through his timeline. Firearms enthusiasts may enjoy spending some time there.