Unless you are a DIYer bringing it in will cost you some bucks no matter if you replace the axle or just the joint and boot.
Replacing the CV joint is fairly easy if you have the right tool to take the CV joint off the axle.
Here's a link to see the tool in action.
Tool is available on eBay or Amazon I believe for under 60 bucks.
Once the joint is off you can just replace the torn boot.