There is an additional $0.75 per package fee if a Regional Rate box is deposited at Retail.

Rates for Regional Rate boxes are the same for Commercial Base and Commercial Plus customers. Regional Box A and Box B remain unchanged. Regional Box C rates are decreasing an average of -18.7% or $5.82 per piece. Retail Rate options - Comparison over prior rates Category Note: No-Monthly-Fee DYMO Stamps customers continue to pay Retail rates. The USPS large flat rate box cost is 17.45 when you purchase the postage at a USPS retail outlet, or 15.80 if you get the postage online. Flat Rate Retail prices are increasing while Commercial Base and Commercial Plus remain unchanged. Commercial Base is the pricing for the majority of Endicia users. The dimensions for USPS Flat Rate Small Boxes are: Outside: 8 11/16 x 5 7/16 x 1 3/4. Recognizing the importance of these packaging types and their actual prices, below are the September 2014 Flat Rate pricing tables for Retail, Commercial Base and Commercial Plus tiers, as well as the Zone prices for Regional Rate. For smaller items, particularly small dense/heavy items that don’t fit in envelopes, the USPS Priority Mail Flat Rate Small Box is a great option. Endicia customers have shown an enthusiastic adoption of the Priority Mail Flat Rate and Regional Rate options.

Usps small flat rate box rates