USPS is by far the cheapest to ship with. I use click n ship to ship with. I used to copy and paste all my customers into click and ship until I came across this wonderful program I have been using. It downloads your completed auctions and then auto fills click-n-ship for you in seconds. It is awesome and cheap too! check it out if you want to save some time and money. Just thought I would pass this info along.
http://www.pony-express-mailer.com

