The USPS doesn't go for that either. Technology isn't perfect . When customers logged on to purchase stamps, they were met with an error message. If there's anything as bad as waiting in line at the post office, it's waiting in line when you have an account with an online postage service. If your Internet connection can be finicky, take that into consideration before signing up for PC postage.
Little nuisances can add up to be big annoyances too.
For example, it may seem convenient to be able to deal with postage offline just by having a small device that plugs right into your parallel port, but if you have another peripheral, like a scanner, that needs to plug into that port as well, you're out of luck. You may find yourself plugging and unplugging. Also, if you are using a dial-up connection, getting online to buy postage and stamp an envelope can be a hassle. Definitely consider an offline product if you have a dial-up modem. Pricing Specific pricing for each vendor is listed above, but don't forget about the add-ons, which can certainly add up.