I don't have any videos, but I've found this book, Negotiating Your Salary: How to Make $1000 a Minute[0] to be helpful. Sensational title aside[1], it's actually a fairly concise and easy-to-read guide with examples of questions/answers for various situations, strategies and counters to commonly-used negotiating tactics.

It's mainly focused on salary negotiations during/after an interview, but I get the sense this is what you were after. Apologies if this was not the case.

0. http://www.amazon.com/Negotiating-Your-Salary-Minute-Revised...

1. The title may not be so sensational in my experience; most negotiations don't take hours and thus while the effect may not be "$1000 a Minute", it may not be that far off.

A friend of mine turned me on to the audio version of this book, "Negotiating Your Salary: How to Make $1000 a Minute" [1], many years ago.

It's more about a mind shift than rocket-science techniques, but I can attest to increasing my income by tens of thousands of dollars by putting its ideas into practice.

[1] http://www.amazon.com/Negotiating-Your-Salary-Minute-Revised...

Worst case, their reply will be "no", and then you can still decide you want to take the original offer. More likely, they'll agree to give you some more money.

I'm no expert on the state of the art in salary negotiation books, but http://www.amazon.com/Negotiating-Your-Salary-Make-Minute/dp... is decent for getting you in the right mindset.