Tesco have halved the price of the 1 litre bottles from £10 to £5, but when I scanned them they halved again to £2.50 a litre. This was at Kingston Park, Newcastle.
If you've got a BMW this is the best oil you can put in as it's longlife for the extended service intervals (but obviously will work in other cars).
This stuff is £15.99 a litre in Halfords.
The pic is for the normal Edge, this is Edge Sport, but you get the idea.