Alcohol is readily available all over Cambodia and their local brews are all very palatable. The bigger local brands are Angkor, Cambodia, Anchor (pronounced “An chore”), Klang and Beerlao from Laos is also popular. Imported brands you may encounter include Carlsberg, Singha, Tiger and Heineken. On average, you can expect to pay between 50US cents and US$1.50 for a local beer and a bit more for an imported one.
There are also craft breweries in Siem Reap and in Phnom Penh who produce some excellent alternatives to the commercial brands available.
Alcohol is readily available in supermarkets and convenience-type stores at prices that will surprise you and there is generally quite a good range of recognisable imported spirits available. If you plan on bringing home some duty-free alcohol, you may want to buy it at a store inside the country rather than at the airport where it will probably cost you more. Just remember to pack it into your checked-in luggage!
Cigarettes are also readily available and besides local brands, you will also find recognisable international brands in most shops. A pack of imported cigarettes (e.g. Marlboro or Camel) will cost you around US$1.50 for a pack of twenty and local brands should be a little cheaper.