At makandra we can provide different solutions for HTTPS/SSL.
Let's Encrypt is a certificate authority that launched on April 12, 2016 that provides free X.509 certificates for Transport Layer Security (TLS) encryption via an automated process designed to eliminate the current complex process of manual creation, validation, signing, installation, and renewal of certificates for secure websites.
https://en.wikipedia.org/wiki/Let's_Encrypt Show archive.org snapshot
There is one caveat: When one of your domains with Let's Encrypt is deleted or does not longer point to our IP and that change has not been communicated to us, the automated renewal of the certificate will stop working and thus the certificate will expire for all your applications after 30 to 60 days and all browsers will show an SSL certificate error.
In the past we only allowed one certificate per IP because SNI Show archive.org snapshot support was not readily available. In the future we will automatically use multiple certificates per IP if needed. Please tell us if you are working with really old Software that does not support SNI (e.g. Java 1.6).