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^ not really great advice.
Your best bet, is wait right untill you will start skiing this coming season and then get your boots. That way hopefully your feet will not grow out of teh boot straight away. You cant really buy big boots to grow into unfortunatly it does not work that way. 90% of people boot problems are caused by big boots. Having a boot a bit small is usally easier to fix.
Also getting a footbed will usally make your foot smaller. You could leave the insole in and have a footbed, this could take up some volume, but I would recomend waiting untill youstart skiing, then when your in a resort go to a decent fitter, and see what they have for you and your foot at that time. You can always get the toe box of a boot streched to get more toe room, but its harder to make a boot smaller then it is to make it bigger, so get what fits you at the time, and then have it streched as you grow. There will of course be a point you cant make it any bigger, but hopefully that would not be within one season anyway.