sbiddle:xlinknz: what are the T&Cs and legals on this, can they simply cancel and say pricing error - they can't do that in a retail store right ?
Yes they can.
I believe they can cancel it, if it is an obvious genuine error. That can be a bit subjective though, especially when there is a sale, because it is normal these days for retailers to have sales for anything up to 90% off the RRP, especially for clearing old stock, or loss leaders.