Effective January 27, 2013 the United States Postal Service will be increaseing the rates for all classes of mail including an increase in a First Class stamp from .45 to .46 cents.
Price changes for the following domestic services: Express Mail®, Priority Mail®, and Parcel Select®. Add-on services like signature confirmation will see a price change as well. Find specific details per service type here. The Shipping Calculator and eBay Labels will be updated to reflect these changes—please make sure your shipping costs reflect these new rates, as well.
Parcel Post® will no longer be available for purchase through eBay Labels as of January 27. A replacement service akin to Parcel Post will be available via eBay Labels in March.
Other details of the rate change can be found at www.usps.com