I went to the professionals section of the King Arthur website and looked to see who in your area sells the KA flours. I found these:
Dawn Food Products, Houston, TX, 800-252-3296
Euromid, LTD, Houston, TX, 800-494-0161
When I originally bought my 50-lb. bag of KASL, I got it from Dawn Food Products just outside of Dallas. I had to open an account to do that, but I was happy to do so since most distributors won't sell to individuals. Not all Dawn locations sell to individuals, so you might call the Houston location and see what their practices are. If they won't sell directly to you, or they have a high minimum purchase requirement, you should ask for names of local bakers or pizza operators in your area who purchase from them and might be willing to buy a bag of KASL for you as part of their next order. You can offer a premium to do this. Most distributors will also sell to individuals who say that they are testing products with the expectation of starting a new business, such as a pizzeria. I don't personally use that approach, but many do.