Greetings!
For some unknown reason, I was looking around for a downloadable version of a specific commercial. I found a great site.
ad-rag.com is a (very low cost) subscription based site with a very large archive of what looks like every commercial ever aired. So, if you happen to be looking for that Superbowl commercial from five years ago, that one-of-a-kind Apple ad or anything in between, this site may be of interest. Quicktime based. (Yeah, yeah, I know - everyone has their favorite codec. This site uses Quicktime...)