Used to be common to buy new boots and boot-clamps as a kit along with a packet of CV grease.
We disassembled, cleaned, and inspected the joint, and if it wasn't ruined, it went back together with fresh grease and the new boot. Honda cars were the worst because the shafts weren't intended to be disassembleable--no taper on the snap ring grooves. You'd have to beat the living crap out of them to get the shaft out of the CV joint. Other shafts would pop apart fairly easily.
There was a guy that sold oversize ball bearings to use in slightly-worn CV joint races. They were a thousandth or three oversize. I never used 'em, but I knew they were available.
I haven't heard of anyone putting new boots on a CV shaft in twenty years or more. Tried to get new boots for my Toronado, and the parts-counterman looked at me like I was from Mars.
I think the days of D-I-Y CV repair are done. And that's a shame, because it wasn't bad work, (except for those Hondas) and the parts were inexpensive.