If wheat, rather than gluten is your main problem, then you have more choices. You can probably buy your beer in at your local shop, being careful to read the ingredients to make sure the beer contains no wheat.
If unsure, contact the beer brewing company. Of course they may have a website, but I advise you to phone them, as you will likely get better information, and use less of your time finding it.
Depending on how sensitive you are to wheat, you will want to know if they keep wheat-free brands of beer separate from any brands or varieties of beer brewed with wheat. You are also verifying that the stated ingredients are correct and current. While unlikely, you do want to make sure that the brewer has not changed the recipe and failed to update the label.
The market is starting to catch up. Specialized gluten free beer is starting to appear on the market to meet the demand for those on a gluten free diet.
For those who just have to avoid wheat, gluten free beer is perfectly safe for you.