OK....I know this is a D&D site, but MERP is what brought me here and between myalbinogorilla and Deadlord, I have taken some heat.  Here I ask for parley.  I am willing to be open with my sources of info and price evaluations.  I ask that on this thread, MERP only is discussed and that any member add what they think a book's value is, should be, and will be now that I am not bidding.  Also, we can discuss why certain books are or should be worth less or more.  Being the visitor, I will defer to anyone else to start.

btb-  I don't think they're MERP.

You're right it's from Isengard and Northern Gondor.

Morgan?
Just kidding. I'm not sure, I haven't even looked at mine.

Ah...greed ...er....or so I have been told...er I mean agreed.  So far as I can see the following factors influence cost

1.  Original cover price
2.  Rarity
3. Evil content.  By this I mean anything with Sauron, Morgoth, Saruman, the Nine, their abodes, their items...etc...Heck, even the LOMEIII goes for much more than a LOME I or II or even the Valar and Maiar.
4.  Cover and inside artist/art.  Angus McBride's greatest are probably Gorgoroth and Lost Realm of Cardolan.  I really believe that is in part why they cost what they do.
5.  Number of pages.
6. Number of color maps
7. 2nd edition...they seem to cost more book per book, partly because they were published later and with more and better content and partly because they were published later and ICE was charging much more on the cover.
8.  The movies
9.  The movies
10. The movies
11.  Resellers...perhaps, but I do not believe to the degree that I am given credit.  
12.  Mike Chapman's charting of MERP sales on Ebay.  I almost forgot this part.  He had been watching them for some time before the movies were released and put them in a composite chart.  If you are not familiar with it, here is the new website:  Page not found | ICEWEBRING

Many people (including myself) give this much weight to their decision to bid.  In fact, it was what I used when I started buying for my own collection.  

Gorgoroth is a combo of the above.  It was one of the last that my cousin ran me through..and only the lower level series.  It is intense simply because of the closeness of the Eye and one of the Nazgul.  Plus, the demon/shadows are very nasty.   The cover art is awesome, showing threee Nazgul in their traditional armor and helms.  It is a 2nd Edition and larger book.  And it has the compiled stats of Sauron, The Mouth of Sauron, the Nazgul, Gothmog, and the military might of Gorgoroth.

That would definitely up its price. I agree, you see the same thing with the H series mods. Not rare by any stretch, but since they require demigod characters, they are popular, hence more $$.

I'll take them as well. I could actually use them.

Well...it seems I am a bit late.  I could put the Isengard maps in the one I just listed...or give it to the winner as a surprise.  I am unfamiliar with the names of the second one, so I am unsure if I could use it.  As I responded third and have the least tenure aboard, I would not feel slighted if you gave it to one of the others.

btb-  The second map is from The Court of Ardor in Southern Middle Earth.