Been collecting historic signed aviation documents and photos for 46 years. Now letting go of my well-known, Life-time collection. Have some excellent ones on Ebay (under seller name of "memaerobilia") and intend to post many more. Never had one signed item of mine questioned or returned. So buy with confidence. Most come from aviation company files and archives, and from well known collectors/collections in the pre-Internet Era.
Have US (all Services); German, British, and misc country aces (Including a combination US/Israeli ace!)
Here is a nice glossy photo signed by US Ace Frank Klibbe, He had seven Vs and flew a P-47 named "Little Cheif" that had an Indian cheif Head dress emblem on the nose. His awards and decorations include the Legion of Merit, the Distinguished Flying Cross with two clusters, and the Air Medal with five clusters. The photo is 4.5 x 5.25. @ $39.00 which includes regular First Class Mail envelope postage in U.S.
If you are looking for a signed photo by a particular ace, please let me know

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hundreds of images of aero art, memorabilia, photos and artifacts at;
www.memaerobilia.com