Ok I'm sorry whats 100e-20? whats the final total usd with tx fee included?
Another way of typing this is 100 * 10^(-20)... or 0.00000000000000000100.
Look, your first post is asking for ~$50. Your second post is selling a gift card for $50. Forgive me if I can't see your account as anything other than a joke and/or a game.
If you're truly serious, you're going to have quite the hard time finding anyone to bite with absolutely no history. Post history doesn't really make the trustworthy individual (see the master-P debacle in scam accusations) but at least we know a little bit more about that individual than the nothing we know about you.
If you want btc, purchase through an exchange. If you want fiat for that gift card, sell it at the store front or on craigslist or backpage.
That's my recommendation.