I think the fork springs fit very few bikes and if it is someone with the same bike and springs, you probably won't find a buyer very easily. Check on
www.racetech.com to see which other bikes their replacement springs fit. Mention that in any ad to try to help sell them.
The shock spring will fit many bikes. I have seen used springs go for $5 and some go for $50 on ebay. If you have a price in mind on the shock spring, let me know. I already have a spare set of the fork springs. Thanks, and good luck on it.