Is it a valuable coin? If not, what Mechanic is recommending should work in many cases. I'd never ship a valuable coin like that, though- the buyer could easily claim that the item never arrived, and since you have no tracking number, they would have the coin and the money refunded to them.
First class works well here, but it does have insurance limits (They're pretty high, though). I sell a lot of computer parts, so smaller lots are shipped this way. They can be insured if you desire, and there is a tracking number. I recommend going for poly mailers- they're those white colored (Usually white, at least) bag-like envelopes that you see in the mail. They're super light, and pretty durable. I don't ship without tracking numbers, but I don't really do many sales for less than $20.
I ordered a decal that was about $1.75 with shipping. It's coming in a regular, stamped envelope without tracking. It's not a big deal, but if I were selling a $500 coin, sending without insurance and tracking would have me sweating bullets....
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