Not sure how handy you are. Built I built my own platform base frame. With a metric fuck tone of storage. With 3 massive drawers on each side. And one at the foot. (King size mattress).

Material was plywood and maple. You could just do it all out of plywood. Cost wise it was maybe 500-600 (Canadian maple dollars), for all material, push to open drawer slides, screws, wood dye (I wanted the maple with a darker colour), and top coat finish.