Camshaft lob and lifter destroyed - 3.0L

[A4alaska]

so I have a decent project going on with my A4 3.0L B6.

A camshaft lobe is worn down and lifter destroyed on the passenger side exhaust side, middle cylinder.

I would like to know what my best options are for repair.

1. Buy an entire head to salvage the camshaft and lifters?
2. buy just the cam new and all new lifter?

3. what is a good source for either 1 or 2?
4. do I replace ALL NEW lifter for the entire head whether I go with 1 or 2?

I have not found a source for a new cam but for lifters I found Pelican parts, OEM and genuine Audi. The price difference was remarkable though, $15 for OEM and $50 for Audi.

Another question I have is what could have caused this failure.
I have seen in other threads that the PCV was suspect for failure of lobe closest to fire wall.

[A4alaska]

I did try to do a search by the subject, but didn't' find much other than my last sentence above.