> Select high-volume shippers are able to drop off presorted packages at the local Postal Service depot for “last mile” delivery at cut-rate prices. With high volumes and warehouses near the local depots, Amazon enjoys low rates unavailable to its competitors.

Isn't this program available to any company that meets the requirements? Local shops and small-like shippers don't benefit because it's too hard, but Amazon's competition (Newegg, EBay, etc) presumably have access to the same programs.