While browsing aimlessly at Tesco Homeplus in Denton I've found half of a shelf of reduced Bio Oil and other scar and stretch mark reducing potions.
Bio Oil 200ml was £4.99
Bio Oil 125ml was around £3.50
There was a lot of other similar stuff from Palmers all 75% off.
Sadly not national.
I didn't get any since I don't have any scars, except for the mental one after yesterday's football. It wouldn't work on this one anyway...