I'm not sure if this is a good deal or not. It's got an old Hayabusa motor with carbs and it doesn't run. Needs some fiberglass work too. I do know when these are running right, there aren't going to be many cars at any track day you attend that will be faster.
https://www.facebook.com/marketplace/item/344339198399237/
Looking over Radical's for sale section shows a few SR3s listed at a bit more than $25,000 USD, though there are few that are much closer $30,000 USD.
And, if it helps, we have a video on repairing fiberglass if you haven't seen it already:
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