The original Twilight 2000 box set is getting hard to find these days. The recent Kickstarter for T2000 4e has increased demand for the classic version.
Well, a fantastic substitute is available: The official Twilight 2000 1st Edition Reprint from FFE. This paperback contains the 1e Core Rules, plus the Poland Campaign… all in One Book.
Twilight: 2000 (1st edition) – Reprint book
2003 … Frank Chadwick, et al … FFE 2001 … ISBN 1558782273
A paperback anthology of the original Twilight: 2000 1e RPG rules, plus the Poland Campaign modules: Free City of Krakow, Pirates of the Vistula, Ruins of Warsaw, and Black Madonna.
See also: My deep-dive into the original: Twilight: 2000 (1st Edition Box Set) – Photo Gallery
A Look Inside
All 4 Poland Campaign adventures are included. Five, if you include the introductory scenario Escape From Kalisz.
Bonus content in the back: A Twilight 2000 Combat Example, and The Compleat NPC. From Challenge Magazine articles.
EDIT Dec 6, 2020
I’ve been told that they are out-of-print, and FFE’s supply of them is gone. They will not be printed again. I still have some in stock as of this writing.