Where are you currently storing them?
I have nail polish carousels for my OPI polishes. This is a pic of the ones I have and they hold 30 polishes per carousel. (It also spins like a real carousel! hehe)
I also have just a regular nail polish stand, similar to this.
I then keep all these on a low shelf in my wardrobe. I then pull them out for when I have clients and they sit on the mani table.
I spose mine are more for aesthetics rather than storage, even though they double as both, if you have the room for stands, than go for it. Just thought I'd show you how I store mine.. I have stacks too!
Here's some more functional ideas. I know this is how some girls I studied nails with store theirs.
Nikki keeps hers standing upright in these type of boxes from Ikea. Then she just has them sitting in the bottom of a cupboard when she doesn't need them.
And Danni has hers in these style of boxes, also from Ikea.
though she now wants to get this one, so she can organise her polishes into colour groups.
Another girl from class used to store hers in something like this, amongst all her other nail products.
I hope you get some ideas from all that rambling!