This is a new NRT product from Nicorette. I personally used to use the nasal spray (it took some getting used to but was very effective) and this new mouth spray is easier again to use.
Cheapest I can see is around £15.49 on line. It seems to be £17.99 in Boots and other stores.
I think £12.00 is a special offer at asda (I got 3 instore).