Mattel bikes are fairly rare and very unique which makes them a bit of a collectors item. One of the most common questions I get about Mattel bikes is "what are they worth?".
It's really hard to say what any particular bike is worth.
I bought mine off Ebay for $99.00. It is a little rough.
Missing fenders, kickstand, needs rear wheel or respoke on rear wheel.
Tires were worn out. However, it cleaned up pretty nice and has a lot of potential.
Basically, a decent fixer-upper.
I've seen others asking $125-150 for rough bikes.
I've also seen Bronco bikes with the tank and V-RROOM! engine going for $400-500 in unrestored condition. I know of one NOS mint in box Bronco that sold for about $1500.00.
Well, I hope this helps you decide what your bike might be worth. But, as I often say, "a bike is only worth what someone's willing to pay for it." Sometimes you just have to find a person that loves it a little more than you do.