Cost for pre-buy on late model Super D

[setha]

I'm thinking about trying to pick up a super d later this year. This is my first airplane purchase and I'm trying to suss out costs beyond purchase price. One thing I'm struggling with is finding any info on what to expect to pay for a good prebuy. I'm curious if anyone here has recent experience and is willing to share details. What factors will play into a prebuy being more or less expensive? Age of the plane? location?

thanks

 

[Big Ed]

Wood vs metal spar. Wood spar inspection gonna cost you an extra grand if done to AD standards.

Beyond that, experience of the inspector with tube and fabric aircraft.