Those are the meters used by businesses who do a lot of mailing.
Unless you are mailing over 100 items a day, you probably won't find it economical.
But google Pitney Bowes.
As a stamp dealer, not only will your customers be happier with stamped envelopes, but when you buy estates you can purchase MNH postage at a fraction of face. A much better deal.
Heck, you can even buy MNH postage here on eBay (nudge nudge wink wink) for 20% off face with shipping and tax included.