I don't know how BB works...
I get demo discs all the time.
DTS, THX and Monster send them to me. I haven't gotten DTS #10 yet though. I have #9 and another one they sent me. It has 3 songs on it in 3 different formats, regular, ES 6.1, and 96/24. The THX one has a few different scene selections in it, as well as most of the THX/DTS/DD intros. Monster sends the majority of them. I've gotten blues demos, christmas, rock, a 3 Doors Down concert that had 3 different surround mixes in it, another one of this jazz singer guy that got stolen, I forgot the guy's name, and many others. Some of them have the surround and stereo recording so you can show the difference. It is pretty handy!
~Chuck