I believe that the German distributor of the game may still have parts available. I recall that there were some issues surrounding Donald's remaining stock here in the U.S.
You can buy them from Numbskull, who now apparently hold the publishing rights: http://www.numbskullgames.com/
The metal bits look quite nice.
Also, the website says (or said, last time I checked) that Grand Conquest wasn't available but direct correspondence with the Numbskull folks (Pat Stevens, I think) indicated that the game was, indeed, available again. I've got an email into them currently awaiting response on buying Grand Conquest with 2 sets of painted figs (nice as the plated sets are, I'm not in a position to drop a couple of c-notes on a 4-player set right now--someday though )
Edit: And I just closed the deal on Grand Conquest +4 sets of painted metal figs, so they absolutely do still have copies of the game and sets of figs available.