Perhaps one of the various, cheap USB2 or USB3 WiFi or Gigabit adapters? Google that. For WiFi, you'll probably need a router that's this fast. For wired, every leg on a wired network would need to be 'gigabit LAN'. Of course, since USB2 is probably what your notebook has, a gigabit LAN adapter would top out at 480Mb/s.
Given all of this, it's unlikely any single site will ever serve anything close to 100Mbs to you. I mean, never. With a big torrent with thousands of users, you probably still won't get that last bit of bandwidth.
High internet connection speed is more useful for multiple users and devices, sharing it. Like getting a VOIP call, while watching netflix on the TV, and downloading stuff at the same time. Plus, re-read your ISP's terms and conditions for weasel words. They will say 'up to'. Expect far less than the maximum, at all times.