They refill at the homebrew shop in the berlin farmers market, i think it was $15 or $16.
Have heard canals swaps out too but never tried it
--Zags Brewing Company--
Stout Conical #1:
Keg #1: Celebration IPA
Keg #2: Oyster Stout
Keg #3: Apricot Ale
Gone: Pumpkin Porter, Founders Breakfast Stout Clone, Lemon Lime Hefe, Kiwi Express IPA, Holiday Red, OktoberFast, Rose Hip Honey Ale, Saison, Hot Chocolate Porter, Blonde, Mad Elf Clone, Raison D'Etre Clone, American Light, Oatmeal Stout, American Cream Ale, Doggy Bag (Leftover ingredients brew - California Common).......