Struts cost about $50 -100+ a strut. SO I would guess that a set of 4 good struts would cost about $400. Installation will take about 3-4 hours. Most shop charge about $80 an hour. So I would guess about $320 in labor.
in a shop it will cost around $350. 00 - $500. 00 depeding on strut damage. on your own. $150. 00 to $200. 00 because they usually have to replace more than one strut due to alignment and weight ballence issues
The strut replacement you are talking about will probably cost your about five to six hundred dollars. If you buy it from a local dealer it could cost you less money.