I have found this service particularly useful while being on a frugal research budget. Especially, with the addition of the death records for the city of Chicago, 1959-1994. Currently the Cook County Clerk's Office charges $17.00 per death certificate requested. This is a search fee charged whether or not it the correct individual.
Below is a screen shot of a transcribed record. Each of the highlighted areas are necessary pieces of information for making a request. The second image is the actual form used for requesting the image. The first part of the form will ask for your contact information. They will email the image of the record once it is located.