From my buddy:
"...are very good (or seem to be). The guy to talk to is John (or Paulette) at "John's family car care", 748 East Dunlap, PHX. 602 678 1447.
They seem to do 'deals' whenever we've asked them, or told them we're on a budget."
I don't know if this is even close to you, but worth a shot if it is.
Play the "budget" card.
Edit: If you do end up there, tell them Paul (a British guy) recommended them.