I have to get it from the Academy on Bryant Irving. It's the quicksilver brand and it usually runs $40 dollars a gallon. DFI is indeed synthetic, thus the extra cost. I've asked everyone and their mom to carry it in Granbury and they always say they will order it and never do.
Amazon would be your next best bet, you can get it for around 35 on there and just wait for it to be shipped, rather than making the trip to FTW.