A zone chart subscription in a clearly documented format is available for $50 a year here:

http://www.usps.com/ncsc/addressmgmt/zonechart.htm

We use it for our rate calc, in fact it's all local based calculation since the rate tables are public:

http://www.usps.com/prices/downloadable-pricing-files.htm

I understand that using the API means no work when there is a rate change, but the rates change 1-2 a year with 60 days notice. Not a huge deal.

-aaron

You can get a handspring (smaller) for under $200. And a qualcom "thin phone" for $89. Hmm.... And you get TWO instruction manuals.