I've been watching eBay for only the last few months, 
waiting for the individual soundtracks to the Bubblegum 
Crisis OAVs to pop up.
I've seen them in con dealer rooms going for at least 
$100us apiece ($800 for the set!).  In the past 2.5 months,
The equivalent of 5 full sets came and went, and I managed 
to get them all for an average of $35-40...

On ebay, timing is everything....