I saw someone mention this in another thread, but I thought it could use a thread of it's own.
http://www.usps.com/prices/welcome.htm
Make sure to go out and buy some http://shop.usps.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10152&storeId=10001&categoryId=18406&productId=29351&langId=-1 to save yourself some cash. I know it's only 1 cent per stamp, but that stuff adds up after a while!
http://www.usps.com/prices/welcome.htm
Make sure to go out and buy some http://shop.usps.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10152&storeId=10001&categoryId=18406&productId=29351&langId=-1 to save yourself some cash. I know it's only 1 cent per stamp, but that stuff adds up after a while!