okay, just got the scoop from my friends from freer. they said that there is a place across from Super S that may still sell/deliver bulk fuel. they said that it looks like the place may be closed down, but it is not and is still open for business.
if that doesn't work out, they suggested contacting either Leyendecker out of laredo, or Argendagi (probably spelled wrong) who is also out of laredo. I will check on both for you tomorrow and get some numbers for you to call if you would like.
hope this helps out.
Capt. Forrest