I have started monitoring prices on the Wiki, but there are not many there yet. There really is quite a small volume of Harn traded on Ebay compared to some systems.

http://wiki.acaeum.com/wiki/Prices:H%C3%A2rnMaster

The Encyclopedia Harnicas still average about $10
Araka-Kalai $15
The Ivinia items maybe $10 without the box
Harnmaster module - a mint one can get $20 + , but poor quality often pass in for less than $10
Gods of Harn and Cities of Harn $10 - $20

The Kingdom modules are the most valuable and sought after
Menglana, Lythia, Rethem and Melderyn will get $20 to $40 depending on the condition.

Now having given away the value, I am actually looking for decent copies of Lythia, Rethem and Melderyn and would be interested to make an offer depending on condition and completeness (do they have the colour maps?) if you are interested!  

If the Encyclopedia Harnica is complete, I'm sure it could fetch pretty money (I'd surely bid on them   ).

Allison wrote:Thanks very much for the info.

Will have a look at the condition, maps, etc.

I think that the Kingdom modules are all in excellent condition and unplayed, but have not really gone right the way through them all. My next job!

Thanks very much again.

Regards,
Mary

Well, if you could drop a line in the Classified section when you will put the books for sale...  

Nice. Harn seems to still be going strong. Just about everything has been reprinted over the last year or so, and Columbia Games is still releasing new Harn material regularly.