Go to the Recipe Database
Pick a style.
Look for "Extract" under the "Prefix" tag.
I'm an Austin Hombrew Supply fan, and they have 1133 offerings, probably all with an extract option.
Drinking: Redhook Double Black Espresso Stout II; Samuel Adams Boston Ale; Abt 12; Neolithic Yellow River Braggot (DfH Chateau Jiahu); Munich Spiced Porter; 60-Minute Tamarindia Ale; Oaked Imperial Whiskey Stout; Redhook ESB. Bottled: Scaldis Belgian Special Ale (first taste 2 June 2013).