Just use purse.io
You make an amazon wish list, share it, copy the link to share, post it into the search bar for purse. Then select your discount (15 percent is best for quick turnaround). Use coinbase for ease of use. There are other options. Purse app has a tutorial. Then you aren't giving Jeff bezos your bitcoin directly!
That's true, purse has worked well for me in the past. But just think what credibility to cryptos that would bring :D