A small point on Warmaster stuff.
Some items may go for a high price but globaly i have noted a serious down of old OOL stuff (i mean former alternate units). Some are still going for a high price but they are (very) rare. Very few of them are valuated around 100$, when it had became a classical reference of price two years ago.
It may be because the game is not supported anymore and collectors have turned their head from Warmaster range.
Or it could be too that most warmaster collectors have decided that playing was more important than alt units, and they have focused on the core units (and are running for skaven, dark elves, daemons etc).
I have noted too that Bretonnian stuff is selling again for a "correct" price, around 20$ per unit (more or less) those last weeks. Only three months ago, nothing could be find under 30-40 or more.
Lizardmen seem to go for prices around 30-35$. At the end of last year (oct), they where going for more expensive prices.
Daemons are between 25-30$. Hordes at frequently more than that. Especially Khorne. This army is more or less stable. Maybe a little less expensive than few months ago.
Dark elves are very expensive, nearly 40$ per blister for months now.
Skaven and Araby go for the highest price i think. Frequently over 50$. Rat Ogres and Jezzail are less expensive.