No details, had to say. A year range might help. But I will bit, anything under $1000, I would be jumping on that deal for a 70-early 80's. If its newer, much more.
As to an effective price range. I don't think there is one. To many people sell them not knowing what they are for $300+-. Rare yes, but I search craigslist and see them every once in a while for cheap.
Louie