Not quite expensive. They sold for around $250 back in the day. If you have an early eighties model, notice that everything is steel. Weight should be around 28 - 30 lbs. You could get one for next to nothing up to ~2006, until gas prices surged. I'll be posting pics of my '87 when I finish a totally sicko restoration this summer. (e.g.

Flickriver: Photoset 'Taiwan Dahon Classic Bike Party' by No5