in reply to scraping usps
Here's an answer to what I think is your underlying question, how to automate retrieval of USPS shipping rates.
The USPS has published a set of tools at http://www.usps.com/webtools/. Registration and use of these tools are free, and the post office wants people to use this service.
Once you've signed up, have a look at Business::Shipping.
Good luck!
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