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: You can also order these supplies by calling the USPS Package Supply Center at 1-800-610-8734 . 2. FedEx and UPS

: Retailers like Staples and Office Depot often carry flat rate boxes. They may provide them for free if you purchase shipping services through them, or they may sell them as part of their standard inventory.

: For larger quantities (packs of 10 or 25), you can order them for free at the USPS Store . They will be delivered directly to your door at no cost.

: You can get FedEx One Rate boxes for free at any FedEx Office location or by ordering them online through the FedEx website .

: You can find boxes for UPS Simple Rate at The UPS Store . Unlike USPS, UPS often allows you to use your own packaging for their flat-rate service as long as it meets their size requirements. 3. Third-Party Retailers

You don't actually have to standard flat rate boxes; for major carriers like the USPS , the boxes themselves are free as long as you pay for the corresponding shipping service. Here is where you can find them: 1. United States Postal Service (USPS) The USPS is the most common source for flat rate boxes.