[rsbrown]

There are businesses whose sole offering is a service to audit your shipping invoices to ensure that you are not being overcharged. One, started in Memphis in the late 90s to specifically audit FedEx deliveries, is now a division of IronData:

http://transportation.irondata.com

[bdcravens]

I guess it'd be remiss of me to not link to Refund Retriever, the company I've developed software for:

http://www.refund-retriever.com