Ladies grab your purses. From February 15 to 18, you can get furs, dresses, tops, bottoms, bags and accessories from YSL, Roberto Cavalli and Valentino at 75% off retail prices. There will even be a limited selection of Dior and Prada purses. The sale begins Thursday at 10 a.m. at the Surrey Hotel on 20 East 76th Street. A word of advice to newbie sample sale shoppers, get there at around 8:30 a.m. to get a spot in line. You’ll want first dibs on the goods and beware, it gets ferocious in there so be ready to throw some bows.