Is there a way I can watch NFL games from 1975?

1975 is the first year I followed the NFL and has special nostalgia for me, especially the Redskins games. Is there any way I can obtain vhs or dvd copies of the full broadcasts of 1975 regular season games of the Redskins or other teams? I'd really love to see the overtime game in St. Louis again where Mel Gray made the phantom catch.