OK, I'm a long ways from Texas, but I get mine at a local independant petroleum products company. I'm just glad they sell walk in even though I can purchase through my employer if needed. I got the name from 3 sources: Yellow Pages, a local TDR member, and the area Detroit Diesel shop.
I notice my price is about a $1. 00 less per gallon than AV Lube, and no shipping, too.