96SC,
I know of no way of getting directly to that specific post, though, the best you can do is to narrow it down to the particular page for that post. Large threads run on multiple posts (as you pointed out - 'The Real Spa Specialist' - currently has 73 pages!).
You want to bookmark or set a favorite (same thing - depends on whether you're using Firefox or Internet Explorer) while you are looking at the specific post you're interested in saving. Once bookmarked or added to Favorites you can always return to that page and scroll down until you find the specific post.
Phil