The LEGO Technic Ford Mustang Shelby GT500 is a nice $10 off right now. It pulls back and releases to send the car driving forward. If you’re anything like I was as a kid, you’ll do this purposefully against a wall to watch it shatter apart. Then put it back together to do it all over again. Though what’s different from when I was little is this LEGO model car can pair with an augmented reality app on your phone. Attempt a series of fun challenges prompted within the app with your newly built car.