I've filled up my YouTube with lots of users with old Buffalo Bills/NFL content. Here's a few (be sure to click on 'Videos' to see their whole library)...
Andy Provin - To me, the most comprehensive Buffalo Bills video content you'll find: Games, highlight films, compilation videos (Obscure Bills QBs who threw a TD and video of the throw(s), for example).
John-Paul Müller - Buffalo Bills Late-80s through 2002 (not every year but a lot of the Bills heyday).
FRANTHESCRAM - Name suggests a Vikings fan, but a TON of old NFL GOTWs and other shows.
jstube36 - More great content (TWIPF with Summerall and Brookshire), plus late-40s/early-50s content.
Comrade Dobler - Classic Cleveland Browns content.
Randy Fast - Lots of Bud Grant-era Vikings videos.
Grey Beard - Even more classic stuff.
And, if you need your fix of NFL Films music (and you think Sam Spence was the only one who created great scores for the films), then Dave Volsky is your hookup. He has developed several playlists of the music that you can click on and enjoy for hours. I've taken a several of them and converted to MP3 and have on a thumb drive I'll bring with me to the Home Opener.
Dave even creates his own compilations and re-imagines long-lost videos that only have an audio track.
I have many more but that's a good starter to satisfy a classic NFL fan's needs.