Hi Jon,
I will give you my two cents worth. First of all, I hope you meant "roadster" instead of "rodster". I can tell you that most members aren't to fond of rat rodding Durants.
As far as prices - It depends on rarity, completeness, and condition. I would say nowadays the range would be between $1000 (car lacks a lot of parts and/or is in serious decay) to several thousand dollars (again depending on rarity & condition).
Bottom line is - what ever a seller is willing to take for it versus what you are willing to pay for it.