Usually, a company like Dell would cancel these orders because it was obvious that this was a pricing error, but Taiwanese regulators have suggested Dell to compensate consumers fairly and threatened to take legal action against Dell if they don't.
For its part, Dell simply says that it plans to "compensate the buyers for the mistake," although it's not clear if that means it'll actually be sending out the monitors -- which, incidentally, would add up to more than $20 million at their full list price.