I have been shopping around for this seat for a while, but not found it as cheap as this. RRP is £160.
The code is BABYGC16 which takes £15 off the price. Find the black model under 'other sellers' for £97, rather than the main seller which is £135. Then apply the code.
I am aware that someone has already posted the non-isofix model for the same price, but the Seatfix model is usually £30+ more expensive. It may be a pricing error. But I can't imagine Amazon not fulfilling it.
Currently out of stock, but order now and they will deliver when it comes back in stock for this price.