Woolworths in Trowbridge, Wiltshire had loads on Saturday when I got mine, and still had 3 or 4 yesterday when I popped back. Loads of Nunchuks etc too.
I did order it on Gameplay but it got backordered. Went into town today at 10ish, Argos didnt have it in stock yet, walked up the road to Woolworths and they had a few on the shelves.
Got home and thought to myself, why didnt i looked at the cables!