We have been gf for 3 years next month. In that time only once have I purchased an all purpose flour. I tried Bob's Red Mill and I greatly disliked it. It had bean flour in it and I just don't like the flavor of bean flour. Everyone and their dog sells their own special blend of "All Purpose Gluten Free Flour." It costs a small fortune. I found that when I was browsing the internet for recipes and someone listed an all purpose flour mix, I would just click on by because I will not buy that stuff because of the ridiculous price. Then a couple of weeks ago I decided to create my own. No, I have no plans on trying to sell it. Most of them are roughly the same anyway. But I have to say, I was really, really pleased with the way it worked. I have used it as a 1:1 substitution for wheat flour in some of my favorite Christmas treats (recipe to follow) and it turned out EXACTLY like as if I had used wheat flour. That said, I have yet to try this in anything fried and I have not tried it in bread but it did work great in everything I have tried it for. So here is what I did for a very, very small fraction of the cost of buying a prepackaged "All Purpose Mix."
Kim's All Purpose Gluten Free Flour Mix
1/2 cup white rice flour
1/4 cup tapioca flour
1/4 cup potato starch
1/2 tsp xanthan gum
I used the inexpensive flours I get from the Asian market. They are very fine and powdery. I just mix it all up in a Ziploc and store it in there. I hope it works as well for you as it has for me.