You can earn bitcoins in many free ways,  one way I earn bitcoins on the side is working on task sites and survey sites. 
I sell my Gift cards to bitcoin exchanges on purse.io or on Reddit.  Purse.io you can add your amazon gift card to your
Amazon balance then, order them their product, the only fall back it takes awhile but def worth it.  I bought at 12,000 USD rate and now earned more since bitcoin has risen on value.