See Lou Milano’s Impressive Mini NFL Helmet Collection
Back in the day there were machines in grocery stores that you could put a quarter in and in return you'd be given a plastic NFL helmet. I spent a huge chunk of my childhood hunting down these helmets. For whatever reason I am missing the Packers but everything else seems to be there (not counting teams like the Titans, Texans, Jags and Ravens which did not exist when I was a wee little kid.
Collections of all kinds are actually a lot of work. You need to round up everything over time, then when the collection is at kick ass level you have to defend it from thieves and store it. One day you look back and realize you lost 20 some odd years and have a bunch of stuff you don't know what to do with. Now what?
P.S. I always got the Bills when I desperately wanted or needed another team the Bills would inevitably come out. No one likes the Bills, they're the worst.