In "Crazy Things Daniel Is Trying This Week," I installed Let's Encrypt SSLs on a couple sites. Working nicely thus far!
It was quite technical for me to implement on my self-managed VPS, but I just checked and my new favorite shared-web-hosting provider, SiteGround, has built-in support and management for Let's Encrypt! NICE! http://buff.ly/2hZeehL [my affiliate link]