They had it in the episode last week also, but didn't have the zoom for confirmation. Still, was pretty clear based on the style.
If only Russian River was as uncrowded as the south park bar. I don't see one person asking Mr. Garrison if he is about to leave so they can snatch his table.
I think some peoples head would explode, and you may see it last on the shelf just slightly longer...
South Park Studios in right next to Beverage Warehouse in Marina Del Rey. I'm sure they have no shortage of beer names to pull from from there.