Ahh, here's what I was looking for.

http://www.digitpress.com/forum/showthread.php?t=102192
http://www.digitpress.com/forum/showthread.php?t=60500
http://www.digitpress.com/forum/showthread.php?t=25836
http://www.digitpress.com/forum/showthread.php?t=19504
http://www.digitpress.com/forum/showthread.php?t=16071

Too bad playinggamesinteractive.com seems to be no more. Fortunately you can still see their interesting list of high-priced rarities at archive.org . They're actually missing a few of the older ones, like Gord@k, Cassandra Galleries, and Alice: An Interactive Museum .