If you are looking to set your prices, then you should find another mill in your area, who is selling timber also, and call them and ask them what they are getting. Sometimes you have to do some market research, by having someone pretend to be a customer and get quotes.
Several sites for lumber and sometimes timbers are
www.woodweb.com and another you can use to find some info is
www.woodfinder.com. In woodweb, you'll have to select lumber forum, from the list of forums, or do a search.
Woodfinder is a search engine and you can put in your info for your type product and then do a search. Good luck, Jim