Excuse my ignorance, but by "magazine clips" do you mean followers?  Or do you mean a detachable magazine?
When I changed my 223 to a 243 I got a new magazine well, mag follower, and other parts from Midwayusa.com.  look in the Gunsmithing section.  If not there try Brownells.
If you mean detachable magazine, expect ot pat $40-50 for a new one.  They aren't cheap.