The last disc I bought for PC was either Just Cause 2 or Sims: Medieval, both over 2 years ago, and only because I could get it cheaper than through Steam or Origin at the time.
I have significantly fewer disc purchases since my family got broadband internet, and I was introduced to digital retailers.
I still prefer disc/cartridges for consoles/handhelds, because i can use them on multiple devices, lend them to friends, plug in and play immediately and even resell them.
I'm slightly less inclined these days because Xbox One has you download most of your game even on disc, so there's not as much benefit over digital, besides price which is often lower.