Thanks for the response!
The reason I was asking is because I'm just starting to explore gluten free baking and have some Guar Gum from ice cream making. I went to the store to see if I could get all the ingredients I needed and saw that xanthan gum is over $10 for a 8oz bag. I imagine that it last for a long time (when you only use 1 - 1 1/2 teaspoons at a time), but if my bread is a flop I didn't want to waste the money. Thanks, KO