a new roller
with decent options and paint will run $45-$50K...and at least a 2 year wait...from about chassis 650 on they did some updates (check the ERA website, also call Peter Portante and give him the chassis # and he will be able to give you dates, options etc..).
also matters if the car was sold as a "kit" or ERA assembled it.
The used market depending on year is anywhere from $35 to $55K.
Depending on the engine work required if you could purchase in the low $30K range you have done well. Its a very well built car.