Hey guys I recently found a box lot of the first series promotion inserts. So I listed one for sale (the face-plated Cobra Commander) for $3, and it sold within the hour. So I was wondering how much these are actually worth. I have a few other of the same, a few for Duke, and numerous others. Can't really find much info out there. Can anyone help? Thanks!

Here is a link to the one that sold and a few other that I have for sale.