There are several ways of finding out stuff on ebay quickly. Certainly you can add saved searches and as soon as an item that fits your search criteria comes on, they email you. Not sure how quick and reliable this is, I use it but not for anything urgent so never checked the time diff between th eitem being listed and the email arriving, they do however arrive at all sorts of times of day, not just same time each day, so I assume they are generated as an item is listed. :shrug:
There is also the ebay pluggin thing for firefox, which may or may not help - again, not really tried out it to any extent, but someone may know if it can help.
Finally, and here is where I am totally clueless, but there is software available especially for ebay, for getting last minute bids, in, etc, is there something that can tell you when certian items become available from certian sellers? :shrug:
Sorry to sound so vague, but I just think that with all the modern technology, there must be a way to be notified of required listings quickly