Most affordable platform for hosting React app with Postgres backend? via /r/reactjs

My family owns a small business and is finally able to do curbside pickup. My dad asked me if I could make him a site that’s basically an online store without actually paying – all it will do is display items (picture, price, etc.) and put items in a cart. For checkout, it will send the store an email of the items for pickup and a confirmation page for the customer.

I’ve been exploring AWS Amplify to deploy and host this, but I’ve heard AWS can get pretty expensive. I don’t anticipate many people to be logging into this site, but I want to stay pretty budget if possible.

I’m stuck on a platform that can hold a good number of images, have a database for items, and also host the frontend. I’ve made React apps with a postgres backend before and it was easy to make changes and develop locally since I could just run an express server in the back while making changes to my app.

Any guidance or suggestion is much appreciated!