Some bakers uses moving boxes from Home Depot or Lowes. They have various sizes but they do have the logo on it so maybe you can cover it or paint the box.
*I also found this: *
I use shipping boxes from WalMart or Home Depot. I turn the box on its side so the cake will slide in and out easily. Instead of using round cake boards, I cut 2 cardboard squares to fit the box and tape them together and cover in paper. That way the cake board fits the box perfectly and won’t slide around in there. Then I put a small piece of tape over the flaps, so all I have to do is remove the tape and slide the cake out.
Hope that helps!
-- Michal, http://cakesdecor.com | My Facebook: http://www.facebook.com/michal.bulla
