Instore and online. Got this instore and it was actually the 330g version without salt and pepper, maybe older packs. Dated May 2012 I think.
If you have Farmfoods nearby then this usually sells at £1.95 but very generous of Sainsbury's to discount this so much... !
Seemed to get an extra 4 Nectar points as well, wow, another 2p to spend!