There a a few brands of beer available in Arambol. The main two are the nationwide Kingfisher, and the Goan brand pilsner, Kings. Kingfisher tastes a bit chemically, and Kings only seems to be available in the smaller 325ml bottles. Both cost around Rs20-30 for small bottles and Rs40-60 for large 650ml bottles.
Some places also sell Fosters (brewed in India) at the same price as Kingfisher, and another cheap Goan beer called Arlem which has a strange taste like it’s been smoke-damaged.