I recently purchased the AAA Texas Classic membership for my cross-country drive from College Station to Wyoming. The membership for the classic is about $52 plus $20 for a new member admission fee.
If you are purchasing a new membership from AAA Texas, remember to give them a call first and check whether they can waive the new member admission fee. I was able to get a waiver for the new member fee and for automatic renewal they reduce another $4.
Its always good to ask before you buy online :) Enjoy.