jecasc - 12:21 pm on May 14, 2011 (gmt 0)

That's strange. I ship with our local postal service here in Germany (DHL) about 40 parcels/day. I have an individual contract with individual rates, a sales representative that visits me at least twice a year, parcels are picked up daily at 2 pm. With 80-100 parcels every working day (>20-25,000 a year) you shouldn't need to drive around post offices asking for advice. This might sound naive and I do not know USPS business service (does it exists) - but shouldn't you be able to call the business hotline and then they send over a sales representative who will tell you what service options are available and make an offer for individual rates and discuss pickup? I pay only about 50% of the normal rates with even the relatively small amount of parcels I have.
I know that some local companies who have more parcels than I do pay regular prices and drop of their parcels at the post office - just because it never occured to them that individual contracts are available and they already qualify for individual rates with only 800 parcels/year. I don't know however how things are in the US. Maybe things like that are not available there.

But on the USPS homepage it says:
"Need help shipping more packages?
Call us at 1-800-ASK-USPS or email us to ask about our shipping services and a sales representative will respond to you within 48 hours."

[usps.com...]

And there is something called "Parcel Select® Regional Ground™" for customers with >10,000 parcels/year

[usps.com...]
Contact at: commercialpricing@usps.gov

My experience with people at local post offices is, they do not have a clue about business customers and it is no use talking to them. I doubt this is different in any country.