It's possible the $350 book could be one of the older limited-edition copies, but I don't know how Amazon would have gotten one of those. That edition of 1,000 might be worth something to collectors, but the Sleeping Bear Press edition included all those courses and more, PLUS color pictures, so that's the one you'd want to own.
Of course, in my library I still have two copies of the ORIGINAL edition of 40 ... I think those are going to be worth something someday.