New CV's/driveshafts-availability

[FACT HUNTer]

Hi again everyone,
I need to get new driveshafts and was wondering if anyone knows where to get them.
I had some suspension work done today and on inspection,found the Lhs outer CV is stuffed.
Tech. reckons that was making the rumble noise on acceleration as mentioned in a previous post.
A driveshaft business I spoke to says the CV's are unavailable but they will rebuild mine.
I can't see that working as they can't re-harden the worn contact areas in the housing,just fit new balls (wouldn't we all love that).
I'd like to renew all the CV's and would prefer exchange driveshafts ready to fit coz that's how I roll-
don't think,just spend.
Any advice ?
Ta. Andy.
Golf "77 1.6 Auto.