On 11/15/18 it was 3.09 for 87 octane. It fluctuates but is almost always, if not always, cheaper than most everywhere else (except maybe Costco). There is a bit of a longer wait though so be prepared for it to take a little while longer.
It's actually, Fountain Valley. Best way is to go to the club and check the gas board near the entrance.
There process fluctuate frequently, but right now, 11/13, it is $3.19 for regular. $3.39 for premium, and $3.86 for diesel.
U can check in the web site
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