Although we sell SSL certificates, we are not an SSL provider, we simply resell them as a convenience. There are far cheaper alternatives available.

If cost is a major factor we recommend you consider http://www.ssls.com

We are not affiliated with them in any way, but we have had no issues when referring customers to them.

Their certificates start from less than $5 USD per year and they have published articles on installing their SSL certificates in cPanel (as well as many other platforms).

See: 

Generating a CSR in cPanel: http://helpdesk.ssls.com/hc/en-us/articles/204179791-How-to-generate-a-CSR-code-in-cPanel

Installing a certificate in cPanel: http://helpdesk.ssls.com/hc/en-us/articles/204093232-How-to-install-a-SSL-certificate-in-cPanel