I am thinking the tickets these places sell may be mob provided or stolen, but they are definitely available.
The whole thing seemed a bit bizarre to me as we had to check in at a few different bars, but eventually the tickets were available.
The girl I was visiting was friends with some guy who used to play for Roma for a year or two and seemed to know everyone in Rome.
I have no idea if they were giving him the tickets cheap or if the mob was involved or what, but when we picked up the 4 tickets for about $45 total, the bar had about 50 left.
-Sean