Taking a stand against price creep, a batch of restaurants is holding entrees to $15 or less. Lively Luna Park (323-934-2110) in L.A., a spinoff of the San Francisco favorite, is home to seriously French entrees followed by make-your-own s?mores. In Miami, the new bayside Roger?s Restaurant & Bar (305-866-7111) does a budget-wise business in chopped ahi tuna burgers, entree salads, and grilled salmon filets. Pinch those pennies further yet at Pinch (212-686-5222, www.pizzabytheinch.com) in New York, which prices its pizza by the inch ? $2 per four inches.