Another inexpensive way to display/store models is to hang them along the wall. I have a rather large amount of aircraft waiting for my budget allow acquiring more display cases for them, so in the meanwhile...they are being hung out of reach of the pets and grandkids, decorating my ManSpace.
Another option is instead of using picture hooks, one can mount a flush fitting curtain rod and loop the string to suspend the models from it. Less holes in the wall. I'm going to give that a try with the next batch (I've got sixty to hang) along with either a flag or poster suspended in the same way as a theme background. Once I get it up I'll share it.