Just a few days ago I spent $200 to purchase a multi-domain wildcard certificate so that I could host multiple secure domains, with multiple subdomains, on a single elastic beanstalk app. It was such a headache to figure out that I needed the multi-domain wildcard cert, then to find one to purchase for a reasonable price.
Now, 5 days later, AWS lets me create one for free in 3 minutes, with zero hassles. I cannot select it in beanstalk yet, but I am sure that will come. I am consistently amazed by how frequently AWS satisfies needs I barely knew (or didn't know) I had.