Sox had one this year by Marcus Walden. But it wasn't a pressure packed save when he pitched the last 3 innings of a 7 run Red Sox win.
Kimbrel tends to lose effectiveness after 25 or so pitches. That makes it tough for him to get multi-inning saves, especially since he tends to go to multi-ball/multi-strike counts on a lot of hitters.
I wrote this the other day, but I'll repeat it here: last season during some telecast, the subject of muti-inning relief appearances came up. The color guy, a pitcher, so probably Hersheiser or Kaat, said that today's relievers are not used to warming up, throwing an inning (or part of one), sitting down for 10 minutes and then going back out there. Starters do it all the time. Nowadays, kids are converted to relievers early on in the minors and are on pitch counts, so they never get used to that cycle. Kelly has been pretty good at multi-inning appearances. Miller as well. It's no coincidence that both of them were starters for most of their professional careers.