meh 
Just my opinion, but I don't think there is much of a market for those kind of things, especially used stuff. Depending on the kind of capacitor, the price of a capacitor costs about the same new as a used one on Evilbay. Plus, you can trust that it works and not have to take the risk of buying a bad component, and it possibly causing more damage to the board if it shorts.
This lot on ebay closes in about an hour, and no one bought it even though it was $3.00. 5pcs Used 4700uF 35V 85°C Electrolytic Capacitor | eBay
You can buy similar capacitors for $1.31 each if you buy ten from this site, for new ones. SLPX472M035A3P3 Cornell Dubilier | Mouser
Again, just my opinion, but I don't think it's worth your time to try and resell those things.
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