$5/month is $60/year, which is ridiculous.
I maintain 5 websites hosted on 5 different domains (blog in English, blog in native language and 3 project websites). The cost of 5 certificates would be $300 per year, or $25 per month.
Right now I'm paying $0 for the certificates of those 5 domains, thanks to Lets Encrypt.
I've been hosting them myself on a Digital Ocean VPS, with really low maintenance, since the machine is updating itself and the websites get built and deployed via Travis. Now I'm moving them to GitHub Pages and my hosting cost will also be zero.