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  1. Showing 1 - 36 out of 179 results for "usps flat rate box sizes and prices"
    1. (1)
      Aviditi White Corrugated Cardboard …
      ($5.30 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
    2. (20)
      IDL Packaging - B-12128-5 Small C…
      ($7.39 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
    3. IDL Packaging - B-1684-5 Small Co…
      ($7.39 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
    4. Aviditi White Corrugated Cardboard …
      ($1.07 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
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