Do I have to charge all the attorneys the same price for my services?

At a deposition when there may be several parties ordering certified copies from me, do I have to charge them all equally?

No.

The deposition officer has no duty whatsoever under the CCP to offer discounts or “group rates.”  In fact, the CCP is silent on the subject of cost.   The deposition officer’s sole duty in this regard is to offer all services equally, which is only fair; right? 

Code of Civil Procedure, Section 2025.510(c):
(c) Notwithstanding subdivision (b) of Section 2025.320, any other party or the deponent, at the expense of that party or deponent, may obtain a copy of the transcript.

Okay.  Here is the thing.  You are a representative of the court.  You are impartial.  Even the appearance of partiality is a very bad thing.  What could possibly look worse than discounting or price shifting:  Hey, you use me and I'll charge you cheaper and charge the other guys a little more to make up the difference.   No, no, no.   That is wrong,  just plain wrong.   I think they call that contracting in today's world:  I got this really terrific idea.  We'll charge them full transcript rate on indexes.  Yeah, that's the ticket. 

Here is the deal:  If you give somebody a break, you have to disclose that to all the other litigators in the case, and then you have to give them the same break.  What you want to do is charge everybody as much as you can and give them the best service they can get.  No breaks, no deals.  Just good service!