Nice rigs there, Philip. You are lucky to have them. As you probably know, military-issue IBAs are controlled items and the DOD is cracking down even harder on anyone selling or buying them. We have had CID come through local shops near Fort Lewis and confiscate every IBA and ACH - they had warrants and local LE to assist them. They are taking this issue very seriously. Most local shops will no longer even buy IBAs, so there is really no source for them unless you are in the military or have connections to GIs.
There has also been an announcement on Ebay that they will no longer allow any type of current issue body armor to be sold.