The other night I suddenly remembered the freshly-curled-by-the-fax-machine Apple price lists that my dad would bring home from his school every now and then. I wish I'd kept those! I started to think, "Hmmm. If I wanted a snapshot at a certain moment in time of what Apple had for sale, how would I do that?"
MacTracker had all the data but it was far from easy to specify, say, "only products from April 1996".
So I spent a day extracting data from MacTracker (long story) and writing a bunch of Python scripts to parse the data and shove it into MySQL, and voilà:
It's ugly as sin right now, but it works! You can punch in a date and get a (sort of) Apple price list from that moment in time.