This is a cool cloud-based service. You can actually buy and print stamps any where from any computer as long as you have an account with pbSmartPostage by Pitney Bowes. No more waiting in the line at the post office. You can also print shipping labels with a help of a postal scale that will weigh your package so you use exact amount every time.
This is great for personal use or small businesses. It's VERY easy to use, all you need is a PC, printer and online connection. Check out the following video:
You can also look into the postage meters by Pitney Bowes. These stamp making machines can automatically print stamps on envelopes, postcards, direct mail pieces, etc.