What are some alternatives?
When comparing CAcert and VeriSign, 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!
DNSimple - Domain Name Service with low cost hosted DNS, an easy to use web interface, and a REST API for automation. Hosting DNS has never been so simple.
Cheap SSL Shop - Cheap SSL Shop is the cheapest SSL certificate provider.
Google Cloud DNS - Reliable, resilient, low-latency DNS serving from Google’s worldwide network of Anycast DNS servers.