the missile kits are still available. i dont know why so many people think there rare and exotic. getting a 2 wheeled bike street legal is easy. $20k if freaking insane!
The early to mid ones are rare! Mid 80's are easily spotted because the not shiny rear maier fender and also the serial number on swing arm, the early numbers are from 2-25 i believe Tom Kite can confirm numbers.
But I agree with you on how expensive or ridiculously priced they are! Tom can still build a kit for $3000 and any atc can be bought here in Az for $2000 and a nice 85 for that.