lay them on a flat surface (back of SUV, or Van) heel and toe side by side, with layers of blankets or bubble wrap inbetween layers of CBGs. I once took 50 CBGs from Wichita to Huntsville in a midsize sedan with no casualities at all.
I've got a big stack of gig bags from past purchases and cheap ones from the Music Go Round. Usually $5 or $6. I've got a dozen of those and a lot of guitar boxes (cardboard). I'll send a sale home in one of the cardboard boxes. Also i've got a few chip board cases. I can get 15 guitars in my Chevy Aveo without any problem.