The $100 version or the $500 version? Decisions, decisions...
If you can't afford to bid a few thousand dollars for anyof the items at Christie's Star Trek auction, you can always buy a copy of the catalogue. There's a two-volume set for $100 (well, $81 if you preorder in the next week or two) and a special limited edition boxed set for $500.
I've never bought anything through a major auction house, but many years ago I did buy an auction catalogue for its illustrations: Sotheby's Roger Rabbit book. I need to get a copy of this catalogue. In the interest of financial stability and marital harmony, I went for the cheaper option.
The auction itself is on October 5, and the catalogue is expected to start shipping a few weeks before the auction.