Picked up a couple in my local big Waitrose, as well as a limited edition imperial stout (£5/£8 respectively). There weren't that many left on the shelf, but would have thought there'd be more coming in - they're not that limited.
Only a 2007 and a couple of 2012 left for me otherwise...
Where have you seen the 2017 Fullers? I've struggled to find it this year (not looked that hard TBF)
I have a few older ones I laid (2007 is the oldest I think)