I think he's using an Abus Granit in that video. Great lock, usually rated around the same as Kryptonite's New York Standard U-lock in terms of strength. But it's way lighter, giving it one of the best strength-to-weight ratios (maybe tied with the Evo Mini), and I hear far fewer complaints about keys snapping or the lock mechanisms seizing up. (Probably still a good idea to do lock maintenance though.)

Try looking around the different online bike resalers, I wanna say I saw it for like $80 plus shipping somewhere. Could be remembering wrong though. BTW, there are different versions of the Abus U-locks, some in the Granit series and some not. But the one I linked in Amazon I use and love.

As the cherry on top, it comes with an awesome mounting bracket. Don't know how many people I've heard say their stock Kryptonite or OnGuard mounting bracket is craptastical. No wonder people are buying 3rd party carriers like the Twofish one. But you won't need one with that lock.