Douglass Oil has operated in Plainview, Texas, over 50 years.  Ken Douglass is the third generation Douglass Oil Jobber and he understands the business inside and out. 
Douglass Oil sells Lubricants, Greases, Gasoline, and Diesel Fuel.  They sell in small and large quantities.  For large quantity purchases contact them a few days in advance.  Prices of Diesel and Gasoline change DRAMATICALLY from day to day.  They use many tools to forecast fuel price changes and they almost always save their customers money. 
You may contact them at (806) 293-9496 or at douglassoilco@aol.com