Hi "patriot3300" (Would be nice to know your real name :-)
My opinion differs a little form Michael's. I bought an old kit and paid right at 1/2 the price of a brand new kit. I think that is pretty standard.
Ref:
https://www.barnstormers.com/classified-1583472-Sonex-AeroVee-Taildragger-Kit.html. Not that unusual.
Also if enough time has passed that the plastic becomes one with the aluminum sheet, it won't come off for love nor money. I gave up and bought new flap and aileron skins.
Be aware that with an old kit you will have to be vigilant about checking print revisions. I got bit a couple of times during the Onex build. One more thing, check both sides of the sheet material to be sure water wasn't allowed between the sheets and left standing. Without a thorough inventory expect some missing bits.
Best of Luck,
Wes