What are some alternatives?
When comparing ClickSSL and SSL2BUY, you can also consider the following products
Let's Encrypt - Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
Digicert - Encryption & Authentication
COMODO SSL - Buy your Comodo SSL certificates directly from the No.1 Certificate Authority powered by Sectigo (formerly Comodo CA). Fast service with 24/7 support. Over 20 years of SSL Certificate Authority!
SafeCyberSSL - SafeCyberSSL is a platinum partner of leading Certificate Authorities.
CAcert - CAcert.org is a community-driven Certificate Authority that issues certificates to the public at...
ComodoSSLstore - ComodoSSLStore is one of the largest global SSL certificate providers.