Pretty common problem with some of the GM vehicles.
Might want to read through a couple of these post to prevent it from happening again.
Sorry that it happened and that that I cannot tell you what it would cost to fix it, someone may come forward with that answer or it could be in one of the links below, I think I seen $300.00.
http://www.elcovaforums.com/forums/s...oor+handle+fix
http://www.elcovaforums.com/forums/s...ighlight=broke
http://www.elcovaforums.com/forums/s...ighlight=broke
http://www.elcovaforums.com/forums/s...ighlight=broke
http://www.elcovaforums.com/forums/s...t=jimmy+jammer
http://www.elcovaforums.com/forums/s...t=jimmy+jammer