If you’ve been eyeing the pricey Beats Powerbeats Pro wireless earphones, this is a great time to go for it. They normally cost $249.95, but you can score a pair at Amazon right now for $199.95, or 20 percent off, with free shipping(Opens in a new window). The Powerbeats Pro feature “adjustable, secure-fit earhooks” that should ensure they stay in place during workouts. They’re sweat- and water-resistant and promise up to 9 hours of listening time, plus their case holds an additional 24 hours of charge. There are volume and…