What would it cost to have front end alignment and cv joint replaced in 2006 kia optima?

I have a 2006 kia optima and the front end needs aligning and it sounds like the left cv joint is "popping". What causes the cv joints to go bad and how much does it cost to fix them?|||CV joints may cost about $2-300 dollars to replace including labor and parts. Front alignment will cost about $50 more or so.|||CV joints are permanently lubricated and have a rubber boot to seal them. If the boot is cracked, torn, or came loose, it allows dirt and water in which destroys the joint. You can buy as an assembly(shaft and joints). Also install new seals. Shop around to get the best price.