Most of those commericals were either part of network or syndicated broadcast. So a search on youtube for commercial breaks for what ever year you want will be easy to find. It doesn't matter what area it was in, most of the commericals other than local station bumpers will be that same. You can find local bumpers and station ID's for almost any station on youtube.
Here is a break from station KDFW-TV in the 80s. http://www.youtube.com/watch?v=xYGtzRNPV1M