Cheapest way is to know someone that is stationed in Korea(preferably Osan b/c they have more stores), last batch i bought a few years ago came out to about 3 bucks a coin. I think the minimum order was 100 coins, otherwise you can usually get a mold made from most online coin shops. Just google military coins.
And don't forget that anyone who is not a 2E6X3 must have unanimous approval from the Senior Dawgs of the "kennel" to get a Wire Dawg coin. We don't want any Joe Blow having one (even though any Joe Blow could buy one just as easy as we can). Kind of ironic. LOL!! Hope this helps.