Royal Caribbean bar prices are typical for mainstream cruise lines. A beer will be in the $4 to $6 range depending on brand. Cocktails are $5 to $10, again depending on the drink and liquor used. Wine by the glass is $5 to $12 depending on vintage.
Royal Caribbean has also gone to using mostly 16 ounce servings of beer, such as the aluminum bottled Anheuser-Busch brands.
They also have a drink of the day with a special price.