They never made a video set, sadly enough. The only way I have found to acquire them is to tivo every occurrence and save them from there. I think if they made a "30 Years of WSM" dvd collection they would clean up.
ESPN shows a lot of old stuff but its at strange hours and a pain to keep track of so anything you can do to automatically record them would be good. I had a couple from the 80's, almost all of the 90's, and all the 2000's but then my DVR crapped out.
Good luck! And if you get them please let us know so I can get them again. Thanks!