Trader Joes carries mostly private-label stuff in general - but that sometimes extends to their beer and wine.
I know Unibroue, that makes La Fin Du Monde, also make Trader Joes vintage ale.
I'm guessing something similar happened with their mead.
Kegged (1/3): Traditional Old Ale w/ Smith Bowman Bourbon
Kegged (2/3): English Barleywine with pineapple chunks & brown sugar