Went into Tesco this afternoon, in the PS3 section they had this HDMI cable (in a clear security box) priced at £1.71. The cashier was surprised but it did ring up at £1.71.
For comparison the Tesco Value cables were priced at £5 a pop.
I brought at Beckton Superstore, sorry I brought the only one left. Don't know if this works online.