avis - put it on an ebay saved search (go into it via advanced search) Ebay will then email you as soon as someone puts this item on for sale - very useful ebay tool.
If this eyeshadow which you are in search of is discontinued, aren't you concerned that you may be buying old or expired eyeshadow which perhaps might cause eye infections? Just a thought...
I can see your point society, I have often bought discontinued favourite make up stuff off ebay and they are usually in a sub-standard, bit dried out condition.