There are a lot of choices.
In my garage, I took a 1x6 piece of scrap, drilled 3/8 inch holes and pounded 1/2 inch dowels into it. Each dowel was about 5 inches long.
Pay attention to spacing. I hang the skis between two dowels spaced about 3/4 inch apart. I space each pair of dowels far enough apart so that the bindings will not touch.
I share a locker at the ski area I work at. We purchased some prefabed units that took up very little space. That way, we can get a lot of skis in.