Being the entrepreneur I am, I decided to sell my own paper boxes! I could only find them in minimum quantities of 25-50 (per size!).
Solution: Nurtured Beginnings paper Hikidashi boxes!
(Fun fact, "Hikidashi" means drawer in Japanese.)
Get $5 off if you mention that you found this through the Nurtured Beginnings website. Just click "Make an Offer" under the "Buy it Now" button and in the comments write "Nurtured Beginnings $5 off coupon"
No shipping fee if you want to pick it up locally (Indianapolis, IN).