New school ones are hugely priced new, and still redeem a lot value second hand as not many are sold in the first place.
KHE do some cracking flatlanders called the A-damn bank breakers new though
My lad has an aluminium Dragonfly flatlander midschool era, picked the frame and GT forks up cheap off Stu at MK. cost me less than a £100 to put this together, already had the wheels and stem cranks