I had the same problem trying to sell and ship spare saddlebags. It's not cheap. They don't weigh anything but they are large.
Some advice: Make sure you really pad and protect the upper tab that holds the rubber side cover grommet. That is broken on every single saddlebag I have and I believe they all broke during shipping, not during use. One set of blue bags (beautiful blue too) I have look like they've never been mounted on a bike, yet those tabs are broken.