What are trusted providers that offer wildcard certificates and associated costs to be used in an Orchestration Platform like Kubernetes?
Have a look at "Ingress" and "Cert-Manager":


With a Kubernetes Ingress you can configure the load balancer, see e.g. https://cloud.google.com/kubernetes-engine/docs/tutorials/http-balancer
With "Cert-Manager" you can get certificates from Let's Encrypt (like certbot does), and it handles renewing automatically. See https://github.com/jetstack/cert-manager