i personally would not got o expense of replacement shaft - why change it?? i've lost count of the number of cvj boots i've changed - with no cv joint problems. does it click on full lock? if you peel back boot and look into joint, is there still fresh grease or dry? ive never seen much dirt in one where boot ripped - if you can remove the shaft yourself, then this job is extremely easy - liteally wheel off, axle shaft nut off, lower ball joint and sterring ball joint off, and remove shaft from box, remove remains of old boot, open up clip in cvj and hammer off joint - but i suppose if you're not mechanically minded, then not so easy! You could do in an hour.

new non-dealer quality boots are cheap (not from dealer, becausw really dear and come as axle sets only, inner and outer cvj boots - who ever needs an inner?!?)