Great tip from a reader!

David Markovitz suggests that when you mail a CD to a client, put some promotional material in the package as well. A postcard won't add as much as an ounce to the weight, so you won't have to add any postage.

If you put lots of papers inside, check how many you can get away with before you tip the scales and have to add more postage. Then ask yourself if it is worth the cost.