This is an instore and online deal. The instore pricing label says deal ends 11th October, same as their site says.
Four types to choose from: fishy, mixed, crunchy crumbles meat, crunchy crumbles fish. Currently meaty surprise, aka crunchy crumbles meat, is out of stock online, yesterday fishy was out of stock so it seems the online stock is variable.
The rrp of this is £3.65 so it is, in theory, half price. You can normally hunt about and get these somewhere at £2.50 but have not seen it as low as £1.83.
...and a bonus deal for those who read descriptions!
If you have a Tesco that normally sells Felix Sensations then check them out as these prices are for packs of eight but if the Tesco sells the twelve packs in store they are scanning through at £1.83 just like the smaller size packs of eights price (they need to be the same name of course, the extra fish sensations is still four quid). Cant prove this with receipt as it just says cat food for them all.
If you get a twelve pack for £1.83 then you are getting them for a third rrp and I like that a lot.