You can do this all yourself for minimal money. Go and buy a sheet of thicker, stiff, high density, black, closed cell foam and a roll of super sticky double sided tape.
Take out your liner and trace the bottom (slightly larger) on the foam and cut out new boot beds. These go under the boot liner. Next trace out the shape of the top of the boot liner. make it a large oblong U shape so that you dont have material at the point where the tongue contacts your arch (this will make pressure on your arch if you dont and you want a little bit of a pocket there to provide space) the end product should wrap up both sides of your foot and be absent or thinner where the tongue covers the beginning of your arch. Next cut a strip or two for the front of your toes.
Use the two sided tape to stick the upper and toe pieces to your liner so it wont shift. Put it all in and do up buckles. if there are any hot/tight spots take a dremel or snippers and trim it down. If it is still loose add more.
I have been a ski tech for years and this is what I would do for you and charge you $100+ for it. You could do it for $10-15.
Hope this helps
push some tightly fitting insoles in your boots... like Dr. Scholls or whatever. Ski shops sell them too, but they cost way more- it sounds like pricing/budget is a concern.
Best of luck to you mang
thank you for the correction Skithespring$....
Go to your local ski shop and ask them for the specialty insole they make for ski-boots. Mine costed 45 bucks- i was just giving you a low budget idea that the tech had given me. Hope I didn't hurt anyone's feelings, I hope I don't get banished lmao.