How much more money am I looking at for an 8ft-basement vs 9 ft vs 10ft.

Hey all

I'm attempting to have a home built in the next year or two. I've noticed the 2 builders I've spoken with both have a standard 8ft basement build in their packets.

Is this the majority of builders?

Also, How much more am I looking at spending in JUST MATERIALS for a 9ft basement and a 10 ft basement. Thank you so much!

Ps. I'm in Ohio now if that helps.