^ do not buy boots online even if you have tried them on. You will still need them fitting such as custom footbeds, getting the liners molded and possibly shell adjustments.
Also if you buy in a shop you will get a boot fit garentee which means if the boots dont feel as good once you start skiing in them you can get them refitted free of charge.
Al of these are reasons why you should never really get a boot online, its just not worth it, even if they are slightly cheaper online.