Found this at the Tottenham Hale Asda Living, there was 2 left after I got mine.
Cheapest clip on PS3 keyboard I could find. The one at Argos has gone up to £14.99.
Maybe not the best but definitely worth it for a tenner. They have had it at this price for a while but they didn't have stock for a while.
I'll upload a photo of the receipt if anyone is desperate for proof.