Not trying to flame or bust your balls, but offer some friendly help.
The more important questions to ask-
1. Can you actually legally send them out? I hear all kinds of different stories.
2. Are you going to get yourself into trouble by "accidently" selling stolen property? Its one thing if you took them off insurgents or found them in the street. Its another if you stole them from new rifles that were purchased for the new Iraqi Army. I dont care, and I am sure that most wont care, but some will.
Also, just be aware that you cannot send items thru the APO system for buisness purposes. MP Customs will investigate and make a big deal out of it... I found out the hard way.
. Your friendly Military Postal clerk will think nothing of turning you in...
As for a price, it depends on the country of origin. Most bayonets are probably not worth the bother, as they sell very cheaply in the US.