Our pricing is constantly changing. That's nothing nefarious. We calculate pricing in realtime, because we get frequent updates on the underlying cost from our

Our pricing is constantly changing. That's nothing nefarious. We calculate pricing in realtime, because we get frequent updates on the underlying cost from our suppliers - daily in the case of the most important ones. I wrote the pricing engine - it's always calculating the optimal price based on what it's going to cost us to fulfill the order from our suppliers. It also dynamically determines which supplier will be the source on any item based on cost, inventory, and other factors, although this happens less than realtime. So price variation isn't necessarily evidence of anything nefarious, it can be the result of an effort to provide optimal pricing that's sensitive to logistical variations. (Note that this is all in a B2B context, which is maybe a little different from consumers.)