I can grab a second-hand first edtion copy at half price of the new Deluxe edition.
First edition, second hand, at half the price of the new Deluxe Edition ? I don't think it's a good deal. The first edition cost, at its release, half the price of the Deluxe so 7 years later it would cost less.
And the Deluxe version is just wonderful, with 2 sets of rules, lot of great components and cover art.