Find Your Cost Of Living

Cost Of Living:
The Salary Calculator
If you make $100,000 living in Beverly Hills, CA, you only need to make around $35,000 if you move to Berwyn, IL. Try other data with this nifty salary/cost of living calculator from the National Association of Realtors.
-- From Realtor.com 

Cost Of Living:
ACCRA's Cost Of Living Calculator
Enter the names of two cities across the country, and the calculator will ask for your credit card. Once you've paid the nominal fee, the calculator will give you the comparative data from ACCRA Cost of Living Index survey.
-- From ACCRA 

Cost Of Living:
Sperling's Cost Of Living Calculator
Although not as much as data as ACCRA, this site's calculator is free.
-- From Sperling's Best Places 

Cost Of Living:
BankRate's Cost Of Living Calculator
This calculator allows you to enter an income for the basis of comparing the cost of living between two cities. Let's compare New York with Chicago!
-- From BankRate.com 

Cost Of Living:
Cost-Of-Living Wizard
This "Cost-of-Living Wizard also reports the salary adjustment needed to maintain your standard of living, and what salary increase or decrease is likely given local market factors."
-- From Salary.com 

Cost Of Living:
Sample Prices Living in Chicago
This guide gives prices of sample staples from world-wide cities. Here's the one from Chicago.
-- From Columbus World City Guide 

Cost Of Living:
The National Cost Of Living Index
Well, there is no such a thing. This Question & Answer from the U.S. Census Bureau gives alternatives for you to explore.
-- From U.S. Census Bureau