If you've been collecting models for a while, you'll surely face the problem of
"where-to-put-themism", the conundrum of having too much of a good thing and nowhere to put it.
The bigger the models, the bigger the problem of space you are faced with as well. And the factory packaging doesn't look like much after a few dozen purchases....

What's a model junky to do? Custom-made display cases can run into the hundreds of dollars, and still not swallow all of the "cool stuff" after a while! After all, collecting of any sort just gets worse as it goes along. The answer: expand! Expand to every available flat surface! Get shelf units, and go upward!
You still face the problem of how to get your models out of the packaging and on display, dust-free.

Here's a convenient, pay as you go solution: try these acrylic display boxes by IMEX. They offer great dust-free, see-through environs for your models; the "aircraft" box holds up to 15 carefully spaced 1/43rd scale cars! The 1/18th scale single car box has some nice clearance to open doors and hoods.
If you have a 1/18th or similar scale model that allows bodywork to come off, display that all very nicely with the "aircraft" box. Both boxes are available with either a clear or a black base. You can customize the clear base by spraying a color of Krylon or model car enamel paint from the bottom side, for a perfectly smooth surface on the visible top side.

So, free those models from their factory-packed bondage! I found both size boxes at my local hobby shop and online. I've found through hard experience that they don't ship well sometimes, cracking the large upper shell. I suggest inspecting carefully in the store or upon receipt via mail.

Large, "aircraft" box size below: 12.44"x10.87"x5.32". Around $22
1/18th scale box size below: 11.5"x7.062"x4.5". Around $18