Prices are really "up and down" on e bay. I recently bought a forgeworld windmill for warmaster at a "buy it now" price of less than £20.00!
If you see it and you want it NOW, you often have to pay through the nose for things. If you are patient and keep trawling e bay, eventually, you'll pick up what you're after at a reasonable price.
Casualty markers - meh, I have about 60 of the things and never use them.
Dave