This Emory University Library page provides links to salary information for graduates of the top 30 MBA programs in the United States. Though focused on full-time program graduates it will give you a good sense of offer ranges and signing bonuses.
Salary.com is one of the most well respected free online salary resources.
Don’t forget that networking with others within the industry as well as the company will help you determine an appropriate salary range. Also many professional associations conduct their own targeted and timely salary surveys. Most associations provide data free to members.
Evaluating Job Offers
Get a Pay Raise
How to Ask for a Raise
Dos and Don’ts of Salary Negotiation
Evaluating a Job Offer