Every minute wasted in the rental shop is time you could be spending on the slopes. That’s the inspiration behind BLACK TIE SKI RENTALS, a convenient ski-rental service that delivers ski and snowboard equipment with custom fittings wherever you’re staying — hotel, condo or vacation home. Born 12 years ago in Steamboat Springs, Colo., Black Tie has expanded to 13 prime locations across the country. This season, the company is also spreading savings, with discounts of up to 30 ­percent on its usual top-of-the-line equipment such as K2, ­Nordica, Salomon and more when you book through ­SkiCoupons.com (just search “Black Tie”).