It's never a challenge to find a beer in Cambodia and even the most remote village usually has a stall selling a few cans. Angkor is the national beer, produced in vast quantities in a big brewery down in Sihanoukville .It is a decent brew and costs around US$1.50 to US$2.50 for a 660ml bottle in most restaurants and bars. Draft Angkor is available for less than US$1 in Phnom Penh and Sihanoukville.
Beer Lao from -neighbouring Laos is very drinkable and one of the cheapest ales you can get. Tiger beer is produced locally and is a popular draft in the capital. Most Khmer restaurants have a bevy of 'beer girls', each promoting a particular beer brand. They are always friendly and will leave you alone if you prefer not to drink. Brands represented include Angkor, Heineken, Tiger, San Miguel, Stella Artois, Carlsberg, Fosters and Becks. Cans of beer sell for around US$1 in local restaurants.
A word of caution for beer seekers in Cambodia. While the country is awash with good brews, there is a shortage of refrigeration in the countryside. Go native. Learn how to say 'Som teuk koh', (Tee please"). That's right, drink your beer on the rocks!