Adobe Stock has some, however, as 360 photography is relatively new there will not be as much to select from as there are regular images. I did a quick check and there are some. You can sign up for a one month trial which includes 10 images per month. If you cancel before the month there is no cost to you.
I should point out that there is a sample image included with Adobe Captivate that is close to your requirements. On a Windows machine you will find it here: C:\Program Files\Adobe\Adobe Captivate 2019 x64\Gallery\360BGAssets\Workstation