I buy direct from amsoil.com. Their price is 10.35 per quart or 40.30 for a gallon. I use Amsoil in both my motorcycle and truck so I bought the 20 dollar a year membership to get dealer pricing. I now pay 8 dollars a quart or 31.40 a gallon. Between my truck and motorcycle oil needs that 20 dollar membership saves me about 100 dollars a year.
Those that are interested you can find the "preferred customer program" here:
https://www.amsoil.com/opportunity.aspx