There are no secrets to earning a $100 bucks every week, all you need to do is work and then just buy the equivalent to bitcoin which is roughly 0.1 btc. If you want to you can always join signature campaigns but the maximum that I see that they offer to members is 0.04 btc, which still is not enough to suffice the 0.1 btc that you're looking for. You can also opt to trade or just gamble just to have some extra money on your wallet if in case.