Nike's self-lacing shoes are back, and you might actually be able to afford them

We've been waiting for years for shoemakers to develop the kind of self-lacing footwear that once only seemed possible in movies, but it turns out that making smart shoes isn't all that easy. Nike is one of the companies that has created such models in the past, including one for Marty McFly. But, at $720, the regular pair of self-lacing Nike sneakers cost as much as a high-end smartphone. However, Nike has figured out a way to make them a lot more affordable, and next year you might finally fin...