Track frames litter back alleys in Japan, where tortured Keirin ex-pros stumble drunk, ranting about that damned NJS and the wind resistance of such huge helmets. Most of the used frames eventually end up in piles at scrap-metal yards where they are melted down for use as doorstops. If you happen to find a used frame at a shop, chances are they'll force it on you, perhaps even offering you money to take the cursed thing off their hands. If you end up in a crooked shop where they expect you to pay for a frame like that, it'll run you something outrageous like ¥50. Highway robbery, I tell you.