Are Zappos based in Ontario (I wasn't sure if that is why you mentioned there in particular?).

Ultimately it will depend on where the company is based; but for the most part mispriced items are usually explicitly accounted for in the Terms and Conditions of sale you agree to (I know that was part of what Argos used over here).

I seem to recall there was a legal argument over it.. because in the real world if a shop advertises a $10 for $1 there is no legal requirement (at least not here) for them to sell it at that price - if they notice. If they accept your offer to buy at the lower price then there is nothing they can do.

The argument was that digital sales worked in a different way (and that manually approving each sale like in a shop was infeasible) so I am pretty sure a lot of work went into making sure the law applied to when the item was shipped. I noticed Amazon still don't take money till they ship the item; so it could be this was never actually resolved.

(by the way I can't find any references to the laws you mention - got any links?)