Originally Posted by Vendot

There is no market price for domains per se as a domain is worth only what someone else is willing to pay for it. However, when it comes to certain types of like 2L, 3L, 4L, 2N, 3N, 4N there are certain sales patterns that tend to be creating floors for these types of domains.

On the whole the first consideration is what is the extension. I only really know about dot com and you can get an idea about .net and .org from reported sales.

As regard "what is random 3 letter domains worth?" the thing that determines the value is the letters themselves so there is no easy way to guage value or appraise without knowing what the domain is.