In my little digging that I did, I didn't run across any Ullman prints, postcards, etc that looked to be modern-day reproductions. I did find the info at the link below dating the beginning of the Ullman Mfg Co to 1888. Also, FWIW the style of the stamp area on the back is very close to that used by another RPPC manufacturer ca. 1905-06 (Ullman was not included in the reference, so I can't say for sure what style they used at that time). Hope that helps, and it looks like others have chimed in regarding price range and rarity.
http://genforum.genealogy.com/ullman/messages/43.html