I’ve only come across one specimen of the first year GTO and it was way out of my price range (at the time). When I was in shop class (around 1970 or so) I had an opportunity to buy the GTO’s little brother, a 1963 Tempest. It was a sweetheart of a car, featuring independent suspension (all but unheard of in most American cars) and an all-aluminum V8 motor.
Alas, I couldn’t swing financing and the seller found a buyer elsewhere.
It ain't so 'little'. I have a friend with a restored Tempest of that vintage. It turns out it's quite a rarity. The reason is that a Tempest can be turned into a GTO by buying readily available knock-off parts that fit right on the Tempest. It then becomes a GTO - sort of. My friend says that a large number of restored 'GTOs' in auto shows are actually Tempests, based on the VINs, and restored Tempests don't ever show up.
Independent suspension
My Cousin Vinnie