Not the case about them being obliged to honour it.
Quote taken directly from Ebookers website terms and conditions
"c) In case of an obvious error (including any error in electronic labelling, error in data entry, error of calculation or clerical error) resulting in the display of a price which has obviously been displayed by mistake, we reserve the right to cancel your reservation, even if it was automatically confirmed by ebookers. You will be informed of this as soon as possible, to allow you to make a reservation at the correct price, if you wish to. In any case, you will not be entitled to claim compensation from ebookers on the grounds of the cancellation or the related costs, if any, that have been incurred due to an erroneous reservation which has been cancelled"
If its an error then i'm fairly sure you won't keep that price, Lets just hope it's an amazing and genuine deal, though I do have my doubts, Fingers crossed for all of you that booked.