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AWS offers free certificates, including free wildcard ones. I've only used them with other AWS services so I'm not sure how easy it would be to use one of them outside the AWS ecosystem.

I've used Gandi just about my entire life for DNS & Certs. It was probably their tagline that sold me.

Anyhoo, they do wildcard for starting at 120,00 € excl. VAT/year.

https://www.gandi.net/

I had over 100+ domains with StartSSL's free service. They worked for my needs. Revocation cost a lot of money for something that was not my fault.