I know there's companies that pay their employees the same amount independently of location (ie, an employee with skill level N in San Francisco earns the same amount as another employee with skill level N in Atlanta, Mexico City, Vancouver, Bogota, etc).
I'd be very interested in a site that compiles those companies.
I worked for a company like this. Usually their range is not the same as SF or NYC, but some less expensive US city.
Try looking for "location agnostic" companies or companies without "location factor".
btw, it would make a great section on Awesome Remote Job [1]