Kokoda trail, which means maps 34 and 35 are now officially rareities. Half the scenarios in Nihon Silk call for these maps, and as jungle maps they can be combined with Saipan and Marianas to create additional jungle enviornments.
Keep in mind Noble Knight has posted a copy of Distant Oceans for $95 on eBay for a long, long time and it's still unsold.
You could only find copies of Heroes of the Soviet Union for $95 on eBay two years ago. These copies did not sell and you can see much cheaper these days (I got an unpunched copy for $28 last year).
The only portion of my collection that qualifies as part of an "estate" are the La Battaille games. Everything else is pretty much tag sale stuff according to my wife.