Vitamin d3 insufficiency?

🙈🙉🙊 • Mom to 2 amazing little boys.
I just got a letter from my fertility doctor saying my vitamin d3 levels are in the "insufficient" range. I'm not deficient...yet. So they want me to start taking 3000iu of D3 daily. Doesn't anyone have a recommendation? Do far (without having to order online) I'm only able to find a gummy vitamin wih 3000iu (at target) anyone else?