So far, the policy at Featherweight Altimeters has been to charge for shipping what it costs. This includes the direct cost of postage and supplies, plus a few dollars (currently 3) to cover the time of the person who prepares and packages the order. The idea was to let customers decide for themselves if they want to save some money by combining more purchases into fewer orders. I also have chosen not to ship via methods that don't have tracking, so that means that USPS Priority mail is generally the least expensive option. When I started in 2006, a USPS small flat rate box was $4.80 and I charged $10 flat rate. Now it's $9-10 and I charge $12-$13. A few times a year I get an irate email from a customer who is outraged that I'm charging $12 shipping for an $8 battery or one or two $25 magnetic switches. I have also noticed that for myself, Amazon's "free" Prime shipping encourages me to buy more. They have really raised the bar on frictionless buying. Which makes me think, maybe I'm missing the boat and I should just incorporate shipping costs into the price of the orders on the site? What would make you happiest as a customer?