Something similar happened with some ipaq's recently on another website.

It depends on the wording of the confirmations, whether on the site or by email, and the exact pricing mishap.

I ordered a Kodak DX3700 for £100 last year - normal price was apparently £380. After a big hoohah and test case they offered them to everybody at that price. Personally I think the camera is just about worth £100 but it's nice to have a second camera to carry around without worrying about losing/damaging it:

http://www.kodakcamera.co.uk/

The key points were:

1) The price wasn't stupidly low, and it had "SPECIAL OFFER" in red next to the price.
2) The confirmation emails talked about a contract and your rights to cancel the contract and keeping the email as a proof of purchase.

Gareth