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DavidThe 'Collector's Guide to Early Baseball Photographs' is coming out with a second edition in about two monthes and it will have a section on wire photos (already written).
You might wish to check with Greg Manning Auctions, as they always have a great variety of origina wire photos, it seems most from the Baseball Magainze Archives.
As there is ignorance/confusion about wire photos, there are some great deals to be had on original photos of Hall of Famers, other than Ruth, Gehrig and the like. I bought on eBay a beautiful, original and high grade 1930s photo of Herb Pennock for $15.