I'd wait for Traveller to come around and say anything for certain, but the following is what my experience has been:

The Megatraveller aliens book is worth a decent amount.  (Most of the DGP books are.)  Exactly how much likely depends on if you get the right people interested or not.

The New Era books are, from my past experience, probably in the $5 range.

The rest, I can't comment on.

Kingofpain89 wrote:But the majority of the New Era stuff is pretty common and you should expect to get no more than $10 for each of them with the exception of Vampire Fleets which floats between $25-$40.

I now feel lucky about my copy of Vampire Fleets, as it seemed to slip under the radar. :)

By the way, Blackmoor, I might be interested in some of the New Era stuff.  Depends on the price and a few things on my end that I need to check.

TNE (Traveller: The New Era) suffered from the dual problems of a system that wasn't Traveller and a setting people weren't all too keen on.  The system was the GDW house system, which was made available for the Twilight: 2000 revision and Dark Conspiracy.  The setting?  They blew the Imperium all to hell so they could start over.  Sure, you had the Spinward Marches if you liked an Imperium setting, but it just wasn't the same.  That, plus the extreme mechanics changes made the game a bit unpopular.  The savvy gamers that wanted to give TNE a try bought the Survival Margin book in addition to the core rules.

With that said, the New Era books are not particularly scarce or valuable.  Like 2300 books, you won't get much more than $5, Vampire Fleets excepted.  That one will net you about $25.

Now...let's get to the MegaTraveller material.

To correct a possible misconception here regarding DGP material, only the MegaTraveller DGP books like the World Builder's Handbook and the Starship Operator's Manual have significant value (in the $50 range).  This is because Marc W. Miller doesn't have the rights to reprinting the material, and the rights holder won't allow reprints without meeting his insane price ($100,000).  Therefore, these books are likely NEVER to be reprinted, and it's this knowledge that the books won't be reprinted that keeps the prices high.  The magazines listed above, while for MegaTraveller, tend to not have the collectibility of the books.  I'd recommend selling the two as a lot with a starting bid of $10 and see where that takes you.

As I was saying, the MegaTraveller DGP books are the only books with significant value.  The two aliens books listed above are two of the books with significant value.  Each should fetch $50, perhaps much higher.

The Astrogator's Guide to the Diaspora Sector is the second to last product GDW published for the MegaTraveller line.  As a result, fewer of them were printed than the early books in the run.  Its value lies in its usefulness for any edition of the game since it's nothing more than a sector map and a 16-page booklet.  Amazon has three of them available, starting at about $20, which to me seems to be a bit out of line given what the guide has inside of it.  I'd list it at about $10 and go from there.

The two ship deck plans are by Seeker Gaming Systems and multiple printings exist.  All had their title sheets redesigned to conform to the look and feel of the other MegaTraveller books and supplements.  They don't come up too often, but they also aren't especially valuable as each ended up being reprinted by themselves, as well as being made available in MegaSets, of which two were produced covering all the deck plans.  I'd list them at $5 each and sell them that way.

My opinion of course. :)

Thanks guys :D