Codecanyon is offering a $50 software bundle targeting those who write and bill their time. It includes 1 Password, Billings, TextExpander, LittleSnapper, WriteRoom, Radium, Arq and Alarms. You can find it here:
codecanyon.net/bundles/freelance_mac_apps
gigaom.com/apple/a-freelance-sta … ontractor/
The total value is over $300. Having a need for any two should cover the cost.