Now that it has had a while to collect data, I'd like to introduce one of my trivial little projects:
amazprice. It records and plots Amazon product price history.
All the heavy lifting is done by perl, RRDTool, Net::Amazon, Data::Dumper, and RRDTool:OO.
Get the source.
I had left a CD in my Amazon shopping cart for over a year. As months went by, I would get messages from Amazon telling me that the price of a item in my cart had changed. I realized that the price on this one CD had varied by as much as $8 at times. Being curious, I wanted a more formal way to record item prices over time. Besides, this gave me an excuse to play with
AWS.
It is worth noting that I wrote this before Amazon made their pricing data available via AWS, so I didn't reinvent the wheel out of blindness.