There was a server based out of Quebec that was up that hosted the movies and hi-res graphics for the game; it was asked by Interplay to cease after the Limited Edition re-issue was brought out (and from that I had the impression that HotU took their links off too -- I guess I was wrong). Pity, because AFAIK, it was the only place that had those files.
Here is a forum post that pretty much told it like it was. $50 bucks...ouch. And check out the price for the FS 2 rerelease on
Amazon...$134!?
The last time I payed anything even close to that for a computer game was for the coveted Marathon Trilogy Box Set back in '98.
[EDIT]: Whoa...I was totally, totally wrong...links to missing HotU files
here and
here. Halleluia!