Did you try rrauctions? Nixon stuff is pretty easy to come by.
Thanks for the message. My only resort for collecting autographs through the mail or via this website is because I don't live in the U.S. This is what makes it challenging for myself as I am unfortunate to just get on a plane, take a train or drive miles to get an autograph. Though for most of you everything is easy to get an in-person autograph but my situation is different.
Easton Press books are reasonably obtainable and could be cut then paired with a nice picture for display.
You can look at several of the auction houses and/or dealers. From my understanding most will ship out of the United States.