given how much he talks about coffee cups I'm kind of surprised he doesn't have his own reusable one. I got mine at the university cafeteria where I was a student. It has a built in hotstopper and heat insulation (the coffee stays hotter for longer and the cup itself is not as hot either).

p.s. we also got a decent discount on the coffee if we brought a reusable cup

EDIT: found the one that looks exactly the same on Amazon though mine is branded with my university's logo.