Yes, they fill growlers. The prices vary, of course, based on the beer. Currently (5/8/19), the price for a 64oz. growler fill ranges from $11.95 (Firestone Walker Pivo Pils) to $62.95 (Oskar Blues 2018 Barrel Aged Ten Fidy). As you can see the price range is quite large, based on the beer. I would suggest downloading the DigitalPour app, which will show you all the beers currently on tap, along with their prices.
They will fill growlers and also crowlers. Price varies depending on the beer you want.
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