I've been following Let's Encrypt since last year. They provide certificates for encrypting websites so they use https instead of plain http. With automated renewals. And it's free.
I've been planning to do this for some time. I have a few months window before the next set of visitors arrive, so I will start working with it this weekend and attempt to get it all set up.
My Linodes are in a bit of a mess right now. I have two, not one. I need to finalise the new one, move the last bits from the old to the new, and then switch everything to https.