recommendations on how to determine domain name value?

[ThinkBig]

I've got a three year old domain name that I've never done anything with. I'm debating if it's worth trying to sell, or if I should just let it drop. i don't want to keep paying the yearly registration fee. It has a single home page that says "welcome to my domain-name.com" and is indexed in google and bing.
Are there any good websites that can determine if the name has any value and how to sell it? Thanks in advance.

[JerrickYeoh]

Age of the domain
Backlink of the domain
and most important is the keyword of the domain .