I use a pistol case for my tanks, and some random infantry. You can find them on amazon for about $8-9 with perforated/eggcrate foam.
THAT WHICH DOES NOT KILL US, MAKES US STRONGER!
THAT WHICH KILLS US, MAKES US STRONGER!
WE ARE THE RIPPER, THE TEARER, THE SLASHER. WE ARE THE TEETH IN THE DARKNESS, THE DEATH!
WE HUNGER. WE CONSUME. WE DO NOT CEASE!
WELCOME TO THE NIGHTMARE, WELCOME TO THE DEATH, WELCOME TO THE DARKNESS!
-Psychic Scream of Hive Fleet Devourer