You can get two pairs for £54.95, with a free pair of more mile socks for each pair:

http://www.moremile.co.uk/product.as...ID=&P_ID=40429

Anyone else got a pair they can comment on? Bet they'd last as long as Inov8 330/333 (which isn't long to be honest) but at least you won't be as much out of pocket.