Filed under: Montauk Sea Grille at Gurney's By Nicki Donato Sep 9, 2009, 11:21am EDT The Restaurant: Sea Grille at Gurney'sThe Deal: Three-course prix fixe dinner for $25.95.When/Where: Mon-Thurs from 5:30pm; 290 Old Montauk Highway, Montauk 631-668-2660.