1 Since each car will have four shock absorbers, a do-it-yourself job could cost upwards of $400. 2  To have a mechanic perform the job, the charge could be anywhere from $300 to as much as $900 depending on the number of absorbers that have to be replaced. If the air suspension shocks or the struts have the be replaced, this can cost anywhere from $300 to as much as $2,000 in addition to the prices mentioned above. 2  After the installation has been completed, some mechanics may want to do a realignment.