If there is one candy I love it is certainly the A&W Root Beer Barrels by Brachs.
The standard in candy form is a safe way to go when captured by a sweet tooth. However, there are many other options worth consideration, I thought I could mention two other favorites of mine.
Claeys Candies carries a wide variety of hard candy options including Root Beer flavored. This candy is a bit rough around the edges, literally, the candy has rough edges. This must be the "old fashioned" side of it. Beyond that it has a very deep flavor of distinct root beer extract, very yummy and long lasting. I find Claeys commonly at Wal-Mart.
Now if jelly beans are your fancy then might I suggest the best jelly bean found in this great nation. Jelly Belly jelly beans are by far known for their wide variety of distinct flavored beans. Each bean can be identified by their color and yes they have A&W Root Beer Beans. These brown beans of jelly are so full of root beer flavor you will wonder how they fit it all in. And yes they actually taste like A&W. In a variety bean bag these are always the first to go, at least when I am involved.