My son Peter just bought a low time 1986 RV-4 for $30,000.
This price gets a well built basic bird with O-320 & fixed pitch prop. It has simple everything and sparse old avionics.
I've ridden in it, what a hoot! I know it's common on this forum to talk up fancy panels, interiors & paint jobs, but a basic RV-4 that is light and simple is a joy in itself.

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Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is
nothing-absolute nothing-half so much worth doing as simply messing around with
Aeroplanes
(with apologies to Ratty)
2019