It's easy and confidential using a buyer-broker to acquire a desired domain name. Our recommended domain buy service is free. Check name availability by Clicking-Here and typing-in name of interest and extension (i.e. example.com example.org) to inquire or get a price.
The domain name broker can also check availability of similar website names in the same or closely related categories like the web-page which led you here (which exact-match name itself may or may not be available).
If the website name which interests you is listed for-sale, the cost is based on domain-name value only, without considering value-added by existing website the domain may have.
By the way, if the domain resolves to a developed site, it's possible to include that website in the sale at a reasonable cost (if you want it vs developing or using your own site). Keep in mind the real value is typically in the domain name and rarely based on a website (except large developed sites).