When it comes to finding a trusted partner for SSL certificates you can definitely go all out and pay a lot of money. When you still want the security and backing of a trusted organization but don’t want to shell out hundreds of dollars, then I would recommend you take a look at ZeroSSL.
They do offer a free option, as they always did, by way of a plan giving you 3 x 90 day renewable certificates. If you want a bit more, like unlimited 90 day certificates and 3 x 1 year certificates, then the $10 per month option is also incredibly good. The best thing about the free option is that you don’t need to put a credit card on file when you sign up. Free is free basically.
The certificates are also multi SAN or wildcard, at the same pricing structure. So getting a wildcard certificate for your domain is now a very cheap option.
To get started with ZeroSSL use this link, it will take you straight there.