Don't forget Ebay and paypal fees.
If your selling it on here, just post an ad and put the price you want or best offer and see what happens.
I sold a NIB 15lb Sapphire Zone on Ebay 3 years ago for $300 plus shipping. I started it at $125 because I saw another one on there end for $225. It was on there for one day and went to $300. I ended the auction and sold the ball. About 3 months ago there was another 15lb NIB on ebay for $100 plus shipping. No bids, was relisted and got one bid and sold for $100 plus shipping. You never know what you may get if someone is interested.
Be good, or be good at it.