: You can order boxes in bulk (typically packs of 10 or 25) directly from the USPS Postal Store . They are shipped to your home or business at no cost, usually arriving within 2–5 business days.
: You cannot use your own box and claim the flat rate price; you must use the branded USPS Flat Rate container. where to buy flat rate boxes
: Retailers like Office Depot and Staples often stock these boxes. They may be free if you use their on-site shipping services. : You can order boxes in bulk (typically