When you pull up to gate 5, there is a sign with a number to call. Gate 5 is just on the south side of Hanger 24 restaurant. Call the number and they will open the gate. Go around to the right to the big white fuel tanks. There is a pump that takes credit cards. It was $6.20 a gallon on Sunday.
Ended up getting it at the airport. I was told they are getting rid of avgas at pumps in Havasu. Airport will be the only option. I cant confirm that but is what I was told at Chevron near Arby's.