Spot instances can make running a website really, really cheap. In my experience, though, it hasn’t been as cheap as I had hoped. So I re-created this site using a t2.micro EC2 instance which is supposed to run at less than $0.01 an hour.
Of course, as the site runs, it needs a static IPv4 address which adds an additional half a cent cost. This isn’t super expensive, mind you, but it adds up.