Under Com. Code 2305(2), a party that has the discretionary power to set the price of goods under the parties’ contract must set that price in good faith. Section 2305 defines good faith as the observance of reasonable commercial standards of fair dealing in the trade, and .includes a “safe harbor” provision, providing that “in the normal case a posted price or a future seller’s or buyer’s given price, price in effect, market price, or the like satisfies the good faith requirement.” Here, the Circle K charged a price in effect, so it was presumptively in good faith unless plaintiff showed it was discriminatory or commercially unreasonable. Plaintiff didn’t claim the price was discriminatory and couldn’t prove it was commercially unreasonable because Circle K set the price within the range of prices set by its competitors, including at least one that charged higher prices.