The rules can be found on the league's website..
https://fantasy.nfl.com/league/5352952/settings
There isn't a 'buy in' but if you are in 3rd through last place, you need to ship beer.
With the payout, noting is really set in stone but I believe that the minimum is a 22 oz. bomber of commercial beer.
Most of us would send about 6-8 singles of different sizes (i.e. 16 oz., an occasional bomber, 12oz cans, etc...)
As
@betarhoalphadelta pointed out in post# 807...
- 9 players ship beer to the champion
- 1 player ships beer to the runner-up
- 3rd place consolation playoff game, the winner decides who they are to ship to, and 4th place ships to the other--this allows for the winner to potentially save on shipping costs