Unfortunately, the sale is over, but: http://www.gamemusicbundle.com/

There's a similar music albums bundle sale at the moment, but it's not exactly the same (not pay as much as you want, but 10$ for 10 albums, which is great also!)

http://www.soundsupp.ly/

Wow, that's awesome. Thank you for the link.

I suspect a "music pack" has a very low chance of having much value to any one person.

That doesn't make any sense; there's a lot of overlap between different people's music tastes and across genre fans. Even so you could also easily have things like a punk rock bundle, rap bundle, electronic bundle, etc and that might even be more lucrative.

You could suspect that too for a game pack, but then comes the low price.