collections of keyed people to generate crowds?

[sv]

I've been asking this in other forums, but might as well ask here as it's a great community

We have a project coming up, and due to time constraints and budget constraints, we were hoping to purchase a collection of pre-keyed footage of general crowds, or just various people doing day-to-day stuff to populate the backgrounds of our scenes. (Videos, not still photos)
Can anyone recommend such a collection?
I've been trawling through Google searches, but they aren't coming up with much immediately... And a recommendation is often the best way forward...

Many thanks.

[dapeter]

Well the two I'm aware of are:

http://www.greenlayers.com/

http://allbetsareoff.com/products/crowd-control/

[dellis]

Nice...wasn't aware of those. Thanks!

[duke2]

Wow. That crowd control site is obnoxious.