CV Joints vary from place to place, so both shouldn't go for much more than $180.00
But I could be wrong too....

The way to tell if it's the CV joints for sure, is to see whether it clicks when you don't have pressure on the joints. For Example if you mash in the clutch when cornering (in a parking lot or someplace where you'd make a sharp turn at low speed) you shouldn't hear the clicking. It's usually only when you have the engine and tranny active that you hear the clicks.