Storyblocks
With one subscription, we get access to unlimited downloads from their library of stock photos, graphics, videos, sound effects, and music. While their library can be limited, they still have a lot to offer, so it is one of the first places we check.

Depositphotos
When there's something specific we need that we can't find on Storyblocks, we check with Depositphotos. They typically have what we need. We have a plan that lets us download what we need for like $1 each. It's a good deal.

Pixabay
There are a lot of sites to download free photos. This is one of our favorites. Pixabay has a large selection of stock images that can be used for commercial use.