selling price can be any where between 5-7 K up to 15 K (all US $) depending on what shape the bike is in, what it has on it for parts, and what spares it comes with.

Newer model RS250's are going for as much as 25-30 K when fitted with kit parts, and enough spares to basically do anything you want minus a frame (which I found out is a possible spare to keep around).

THe info StephenRC45 gave is the rest of the answers your looking for.
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Charles Gallant