I bought 25 of the 15x12x10 boxes from Staples. That is the minimum order, shipped to your house. It is the least expensive box to ship under Scenario C, so less cash outlay. After 2 shops, the boxes are paid for in fees, although it will take you awhile to actually collect the money back. I add a note at the top of the comment box each time explaining what I am doing. I have used 19 boxes since I ordered them in mid-February, so I am going to look for a coupon from Staples and re-order pretty soon. The biggest advantage for me is that I don't have to spend time searching for boxes anymore. Once Staples stopped stocking the 14x14x14 in the store, it became a real nuisance.
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008