From their Terms and Conditions.
Errors and Omissions
(1) Insight makes every effort to ensure that all prices and descriptions quoted in its catalogue and on its website are correct and accurate. However, the frenetic tempo of e-commerce makes it inevitable that mistakes will occasionally occur. In the case of a manifest error or omission, Insight will be entitled to rescind the contract, notwithstanding that it has already accepted the Customer's order and/or received payment from the Customer. Insight's liability in that event will be limited to the return of any money the Customer has paid in respect of the order. In the case of a manifest error in relation to price, the Customer will be entitled to purchase the goods by paying the difference between the quoted price and the correct price, as confirmed in writing by Insight after the manifest error has been discovered.
(2) A 'manifest error', as the term is used in sub-paragraph (1) above, means, in relation to an incorrect price, a price quoted in error by Insight which is more than 10% less than the price that would have been quoted had the mistake not been made.
they will probably just cancel orders when they realise they made a mistake but worth a shot 
