I have the exact same problem. My CV boots started leaking a long while back, not torn, but leaking around the edges and spraying axles grease all over. I cleaned up the grease and put new clamps on them, but eventually noticed a clicking when first getting the car moving in the morning. Now it's clicking more and more often. And if I do a full lock turn, it sounds kind of like a playing card in bicycle spokes.
I am fairly certain we do not need the Mazdaspeed axles. The only place I know that carries them is Protege Garage and they are $700.
The OEM left half shaft on Montgomery Mazda's site isn't too bad at $108. However the right appears to be $358 which is simply crazy.
I don't really want to put on a cheap axle, but these prices are kind of nuts. Does anyone have any positive experiences with one of the knock-offs? Seems like there are quite a few options. RockAuto, Napa, Autozone, OReilly, and Advanced. All around $70 each.
I just don't want to go through that work and then have to do it again.