Hi there!
I wanted to know what kind of cost I can expect with Watcher and Marvel.
I recall reading somewhere that these are not open source like Elasticsearch, Logstash and Kibana.
Thanks for the help!
They are our commercial plugins.
If you would like to know more please contact sales@elastic.co 
Thanks for your answer! Is there any reason why this isn't stated on the website? For example the pricing changes based on the use case of the customer?
No it doesn't. I don't know the reason behind us not advertising it, ask sales 
At least you are honest about it! Thanks 
I contacted them like you suggested