I doubt I have my numbers correct, but stock epis typically run about $150-200 (again, this changes in location, who the buyer and seller is, and how it is being sold)
I've noticed complete good condition freak sets sell around $50.
What bolt do you have? (red would signify firebolt, yellow is most likely techt, black would be a stock ion one, dunno what color is lucky or deadly wind)
What frame do you have? Any markings on it? Depending on the frame, it's rarity, and it's condition can swing the price either way.
Pictures would greatly help for an appraisal.
Remember! These are only estimations, prices can vary greatly!