I'd call Maestro Gro and see who the dealer is in your area. http://maestro-gro.com/texastee6-2-4.aspx
That said there is another good one called Magnificent Earth made by Bluebonnet feeds. I'm not 100% sure if BB still makes it as I haven't used it in a couple years. But I'll call them tomorrow. Any local feed store that is a BB dealer can get it if they still produce it.
Texas Tee will cost me about me $60 per application. I stick to the holidays. Easter, Memorial, July 4th and Labor.
Mag Earth should cost about the same if you apply at 10lbs per 1000. They recommend 20lb per, but if your soil is in good health and I believe yours is, you can drop to 10lb per.