http://www.roofbox.co.uk/car-snow-socks/ are selling proper auto-sock snow socks, 'this years' are ~ £60 but they have some of 'last years' from £45. The ONLY difference is that this year the manufacturer has reduced the number of sizes they make from 13 to around 8. This means that if you can find one of last years in your size, then it'll fit better and save you £15.