Hosting recommendation for a Django website that allows user-uploaded images

I have a small-size Django e-commerce website that's hosted on Heroku(I paid 7USD/month hobby dyno plan). The database is not big at all. The domain for the website is at another service provider(my client purchased it a long time ago), but I finally managed to make it work after many failed attempts.

However, I recently added a new feature according to my customer's request -- allow users to upload images, which seems troubling if I continue using Heroku for hosting. (Their dynos are not exactly friendly for such design)

I'm looking for any recommendations about other Django hosting services that can meet the need. So far I've checked AWS, Digitalocean, and Bluehost but the price seems all around $20/month?(My clients want the price as little as possible)

So I wonder if there's any suggestion on choosing the service and is it possible to continue using Heroku with additional database like S3(If so what's the price comparison)?