Found this today in two different Tesco Superstores in Belfast.
First store (Yorkgate) had it marked at £18 but no special offer label, second store had it marked as £35 (which is actually the price for the 10 yr old, not the select) but it scanned at £18.
This is the Select version, not the 10 yr old or the Quarter Cask and is currently showing as £25 on the Tesco website and the best price I can find elsewhere is Amazon where its priced at £23.50.
As an Islay Whisky its the peaty/medicinal type and while its not as heavy as its big brothers or Lagavulin or Ardbeg it is a great starter drink for someone wanting to sample the Peaty Whisky style it represents.
I'm sure this wont be reduced in all stores but if you see it then its worth getting it scanned.
I wouldn't pay their normal asking price of £33 but at £18 per bottle its bonafide.