This PDF is a tutorial on how you can get your own Bitmain coupons. They varies from $200 up to $420+ value. You can after this sell them or buy your own miners. However will this be, you will get unlimited resources because you can use this method for unlimited times. This is a white hat method, so nothing bad can happen.

You can buy it from here for only $30 for a limited time: https://www.pastecoin.com/r8NQjEgrolGD