Think you can't afford Tony's? Think again, for there's a bargain for the taking. Considering that the entr?es alone range from $12 to $32 for lunch, Tony's prix-fixe lunch (a.k.a. the Crescent Express) is quite the bargain. Just $17 gets you a three-course lunch with soup or salad (which change daily), a main course (which changes every two weeks or so) and dessert. A typical meal might include white bean and andouille sausage soup, Romano-crusted chicken breast over arugula and heirloom tomatoes, and a dessert of Valrhona chocolate ice cream and raspberry sorbet, which in itself is worth the price of admission.