I also collect Hampton inn key cards and I have several cards I would trade, there is a site called colnect.com there are lots of collectors on this site and I have found a lot of help here adding to my collection. It is free and there are a few collectors that are primarily Hampton Inn card collectors including myself. If you go there my user name is MikePerrone, another good one is Snir he is actually in Isreal he is very fair, and another I have traded with is Guatas I think he lives in CA.
Hope this helps, you can also contact me by email: perrone88007 on yahoo
someof the states I have are:
AZ, CA , CO, FL, GA, IN, IL, KY, MS, NY, NC, OH, PA, TN, TX, VA, WA