In case you missed it, GDW has put the classic Starter set for classic Traveller up for free at RPGnow/DTRPG.
All three booklets (the edition I first owned, without the XP rules of course, which I discovered only after three or four games) are yours to download for absolutely nothing.
Sure, as mentioned there are a few bits missing from Classic Traveller, such as
- Archaic Firearms
But it is a 99% complete game, and really most characters never get many chances to use any XP they pick up along the way.