Here is a link I found of a bunch of commercials featuring models. You can find some really nice hair commercials at this link for Pantene, Head & Shoulders, etc. The files are in .avi format so you can go to this address and download them.
If you're a fan of Liv Tyler and her silky hair, you can download some commercials from this address. The unfortunate thing is they don't have her classic Pantene commercial that showed off her incredible hair. Boy I wish I could get that one............