There are quite a few options
and each in terms of quality, cost and quantity
you can do something as simple as a cardboard box with tin plate and magnets on the bottom of your figs
to something as robust as a full sized Battle Foam kit
I would scroll through Miniature Market's storage selection
I'm not promoting their site over anyone elses, they just have a well laid out site for looking atyour options
and see what might fit in your price range and storage needs
don't forget, for whatever you see, there IS another option of greater or lesser quality; the same goes for price