If you look at the URL for any thread you are currently viewing, like this one for the JRXS thread:
You'll see at the end is a "pagenumber=" statement. Just change the number at the end of that statement, hit enter, and boom!, you're there! If I want to see page 100, I just replace "161" with "100."
Also, you can specify when you do a search to "show results by post" rather than "by thread." Makes finding things a lot easier.