Apple's high-priced headset for toggling between the real and digital world will be available in its stores beginning Feb. 2, launching the trendsetting company's push to broaden the appeal of what so far has been a niche technology. Apple unveiled the sleek $3,500 goggles at a software conference held at its Cupertino, California, headquarters eight months ago — an event that was designed to encourage developers to make apps tailored for a device that projects users into three-dimensional simulations of reality. Apple's announcement coincides with a major consumer electronics show in Las Vegas where the company has long been conspicuously absent.