Have you checked out Pexels? The site claims to have ‘the best free stock photos & videos shared by talented creators’. And you know what, I really think they do. The site is full of great images and videos captured by clearly skilled photographers and videographers.
In this era of highly visual online content and presentation, a resource such as Pexels can help you take your content to the next level without having to pay for expensive stock imagery. As long as you give credit where credit is clearly due to the the great contributors to the site, the files are yours to download for free.
Check out this striking example of a Pexels image taken by Oliver Sjöström.