I'm enjoying some of the speculation in this thread so much I almost don't want to get involved.
Our pricing on new items is actually pretty straight forward. We use a formula to arrive at our price based on our cost and the margin we need to make money on selling the product. It’s a bit more complex than that, but it’s nowhere near airfare demand pricing complexity.
What you stumbled upon was our super-secret Amazon sale. We had a business reason to increase our Amazon sales; we decided the best way to do that was drop prices for a little while. So on new products you will see Amazon coming in a little cheaper.
There was a time when we made adjustments to prices based on what it cost us to sell on a particular marketplace. Now we more often lean on just not listing items on marketplaces where the regular price won’t absorb the fees.
As for the price changing on our website after you purchased the item on Amazon, I can’t readily explain that one. My best guess is that you bought the last one available from a specific vendor, so our cost (and therefore price) changed as well.
We actually do want our customers to be able to price compare, that’s why we participate in so many comparison shopping feeds, and will eventually be launching our own site that lets you compare prices across our items on different marketplaces.
I will admit that our unique (used/collectible) item pricing is way closer to the complexity of airfare demand pricing. We’re basing our prices on past sales most of the time, and external sales research when past sales data isn’t available. We try to keep that pricing consistent, but there are variances for condition and other factors across the same item. Above that, there’s a human factor involved as well, one person pricing may just be more optimistic than the other. After a price is set there are still quite a few other factors that may result in that price being adjusted further.
Hopefully I added something to the conversation. I’d love to tell everyone exactly how we do it all, but I don’t think Scott would keep me around if I gave away our pricing strategy.