I think the phrase "Doh" springs to mind! I literally 3 days ago sold full card backs to TF Blizzard, Tunnel Rat & Psyche Out :-(
TBH honest I'm relatively new to GI Joe, I've been collecting for just over 2 years now and I picked up doubles of those cards right at the beginning of my collection. Even in the UK, trying to get hold of the non US stuff is REALLY hard, I will certainly come to you if I come across those cards (Again).
I understand about those items being "Trade" only, It's frustrating as I got offered a full set of the Battle ribbons on yojoe about a year ago, the guy then sold them on before I could pay! Thanks for the message anyways :-)