It depends on what it was originally paid for to start with and what kind of profit margin the seller has. If you want to pay spot price you would have to go to a precious metal broker like Monex. Individuals like myself sell it for the differnce between an asking price or and a bid price. If you take a car to a dealer he will give you the blue book amount which is the asking price.. If you decide you want to buy it back, he will sell it at a higher amount. That is the bid price.
That is the exact shipping price for a small bubble wrap package to be mailed along with delivery confirmation. Sending them in a plain envelope will damage the piece as it goes through the post office machines and in that type of envelope you cannot buy delivery confirmation. you have to pay for certified mail which is more expensive.