Halfords currently have a 3 for 2 offer on all their car care products. They also have the 1 litre bottles of Turtle wax reduced from 3.99 to 1.99, and it falls under both offers.
So now you can get three bottles for the price of one. Just got three litres for 3.98, bargain!... me thinks!!!
Ofcourse you can mix and match the 3 for 2 offer on other items if you wish but i thought this one was good.