Looking at potentially trading a brick or 2 of Federal UM1B Subsonic .22LR. The blue and white Olympic ammo with dimpled base. I have settled on the Eley Green box sub-sonic HP's for my suppressed .22. So, this is trade-able. Given that it has been out of production for a while, my Google-fu is not turning up any recent "comps" to determine value. Looking for a value that would be fair both ways... Thoughts ?