Would you like to exchange duplicate flight covers?

I am trying to accumulate just about all the different kinds of flight covers and by buying large lots I have a bunch of extras. If you have the same problem I would like to set up and exchange of the common ones, preferably in the US because of the high shipping cost for me to send covers outside the US. If you have a particular flight or year you are interested in let me know.
I also have extra USFDC's but they are hardly worth the cost to mail them. I don't need more FDC's but I will exchange large lots for small lots of flight covers.