Depositphotos is running a lifetime deal on AppSumo, starting at $39 for 100 royalty-free stock photos with their Standard license (i.e. you can use them for most commercial and social media purposes without attribution). With over 100,000,000 images to choose from, you can almost certainly find a great image with the correct license for your purpose!
I have no idea how long this sale will last, but it is running as I write this on 23 April 2020.
Get yours at https://appsumo.com/depositphotos/!