1967 Barracuda info-specific hard to find parts?

A buddy is thinking of selling me a 67 barracuda notchback. I haven't seen the car in decades. I recall it needed a fender and things were a little beat up.

What body and interior parts are really hard to find? And what do they cost for used stuff? For example, used trunk lids usually go for $300 kinda thing?

I am mainly trying to do some research before I get too serious.

Thank you!