A cardboard box for mailing (Cantrell and Mississippi area)

I am mailing a box about 5 1/2 by 13 1/2 by 21 inches but the box it came in is more decorative than sturdy. I’m hoping that someone has a box this will fit in that isn’t too much bigger since they change by size. I can meet around midtown Little Rock if you have something. Thank you for your time.