After much chat, I decided to go for Phytaoil in my big cosmetics overhaul and was pleased to find it on sale in my local Tescos (Cheshunt) at £8.50. It's in the Nutricentre concession so I expect it may also be on offer elsewhere.
Haven't used it yet, so can't really comment on it, but I know others have had samples so there may be a saving to be had.