So, if Omega was willing to put a copy of you in an Everett branch that didn't already have one, how much money would you be willing to bid for this service?

I'm not used to evaluating the worth of Everett branches by count. But for the purpose of this question may I assume you mean "another Everett branch of equal measure to this one, as of the time I click 'comment'"?

As for an answer... um... I'm not sure, a fair bit? Working out my preferences - quantitatively - in situations so far outside the usual realm of operation is tricky.

If Omega was going to charge $100, and the offer remained open for as many Everett branches as you wanted, how many $100s would you give Omega?

After I gave him everything I had I would get a new job that more closer matched my potential for financial gain.

Two extra considerations:

• Even aside from a terminal preference for measure maximization I would consider buying more measure purely for the purpose of giving me acausal bargaining power. (I'm even less sure about qualitatively evaluating the usefulness of acausal bargaining power.)
• Buying more equal-measure branches is different to trying to preserve measure in the one we are in. While I think I have preferences such that I would buy a new one I'm not sure if the default behavior of humans would be to do so.