My husband and I are SxE, we started making our own sodas because its easier and more fun, if you can't find anything at your grocers, find a local brew store and pick up some soda syrup and seltzer water. Make your own, we got a good recipe for some easy made root beer, and tweek with it!
"We have been experimenting with new formulas for a syrup to add to carb'd water, our most recent was steep 1/3 lb of ground malt in 2 cups water, add 2 tbsp rootbeer extract, 2 cups turbanado sugar, 1/2 cup honey, 1/2 tsp vanilla, 1 tsp black walnut extract, 1 tsp butterscotch extract."
All are easy ingredients to find and still inexpensive. If you havea soda stream, use it, if not its good in seltzer water too!