Stride - through PirateShip.com . Especially if you're selling on Etsy, use PirateShip; Etsy attaches surcharges to their shipping prices (in addition to charging you 5% of the shipping price that you set!). So it's a great way to trim some costs in a category that always raises in price each year. You'll see the most savings if you are shipping Priority most often. What other shipping services do you use?