If one is in need of a spare I would check modernspare.com. I bought one for my GR Supra a while back, it comes with jack (adapter included), donut, tools, etc in a tidy carrying bag. It's very convenient.
I keep the spare in my garage as I don't want to carry extra weight, but if I ever do encounter a flat, I'd just call my wife or kid to bring it to me. In case of my Golf-R, I have too many sets of wheels already so did not buy a specific spare set from ModernSpare. Same thing, I already have tools and jack in my Golf-R, so will call my wife or kid to bring me one wheel with tire.. I have a stack of 19" Pretoria's sitting in my garage.