Just FWIW, most any VAG drive axle that is equipped with the Rzeppa style inner joint (which would include EVERY B4 sold here) can have the OEM axles rebuilt pretty much indefinitely. Because, as I am sure cevans knows, good quality joints/boots can be sourced if indeed they are in need of replacement and fitted on to the axle shaft. The axle shaft itself is almost impossible to break. Almost.
It is only on some of the VAG applications that use inner tripod style joints that cannot be easily replaced, and in some cases if a reboot/regreasing does not get it taken care of the axle will indeed need to be replaced.
But the only time I ever have to replace any axle with Rzeppa style joints is if it was previously replaced by some Chaxle by a moron.
Otherwise, the OEM axle can always be salvaged. Also of note, you can swap sides on the joints and place any wear on the opposite position, and this will essentially give even a well worn Rzeppa joint a new lease on life and get any vibrations eliminated and make it like new again. I do this quite often, and then you are just dealing with the cost of boot replacement, not the joint AND the boot.
Disassembling a drive axle on a VAG product is an easy endeavor. If you can get it out of the car, you can take it apart.