White boxes

I don't know where you can get cheap boxes but you could wrap the priority boxes with brown paper. Paper grocery bags are free although a little more time consuming.

Jake

Yes it is time consuming.Buyers on ebay are getting cheaper everyday(just like me...lols)
They want to receive their package in 3-4 days yet doesnt wanna pay for priority fee.

They would not accept it unless i pay the priority fee. even before they stamped it with PRIORITY MAIL inside it has just USPS on them they gave me such a hard time.I argued with the postmaster(hoping he doesnt go postal on me...lols)and told them that Im mailing it thru USPS and the box says USPS.Technically he told me that those boxes are for PRIORITY use only, i just didnt argue anymore.
Most of their boxes can still be turned inside out and it doesnt have PRIORITY MAIL stamped on it.I bet you that they will stamp that too.
I will try that suggestion of yours.Thanks