A few of them. Shelf Beer Trader. Beer Trading Without The BS. There's another one called Beer Swappers that is basically a BiF based mystery swap where a bunch of people sign up for a trade (with various themes) and commit to sending at least a certain volume in oz. of local beers to a random recipient in another distro area and get back a box from somebody else in a different area.
These particular two were previous trading partners from one of those (don't remember which). The thing I like about the groups I belong to is that they're pretty much $4$ trades. I don't tolerate 'trade value' trades very well (like the FT:ISO FB group). I just want to do something fair. If the 4 pack cost me $12, then I want roughly the same dollar amount of beer back.
These particular two were previous trading partners from one of those (don't remember which). The thing I like about the groups I belong to is that they're pretty much $4$ trades. I don't tolerate 'trade value' trades very well (like the FT:ISO FB group). I just want to do something fair. If the 4 pack cost me $12, then I want roughly the same dollar amount of beer back.