Great point that there are new lab and volume discounts. Our data is showing that you should always be negotiating and that pricing is still independent of volume. We've seen cases of companies with 1/10th the spend of others getting better prices by product and overall.
This line from the article made me smile...
"Besides, there’s often no need for aggressive negotiation tactics; most suppliers will accommodate reasonable requests to secure the business of a newly hired faculty member, notes Lisa Witte, president of Fisher Scientific, a lab-supply company in Pittsburgh, Pennsylvania."
Of course a person in sales is going to tell you not to negotiate aggressively with them.