[Wonders]

There is no pattern in the ways the prices change.
They change to a random number between x and y. (Blue sets x & y)

To add to my point above, you yourself must have an understanding of how the server determines x & y.

http://www.discussionzone.net/showthread.php?tid=3641

Exiled is my mentor, and all Judas told Exiled is "buy low sell high".

That's all there really is to it, anyway.