I've been in the market for a large HDD for archiving, in particular a Toshiba X300 16TB. So, I've been watching prices on Amazon (and other sites like BHPhoto) every couple of days or so. Well, yesterday I saw a big price drop on Amazon and took advantage of it. Out of curiosity, I checked the price today and it had jumped back to where it was before yesterday (see price record below from the camelcamelcamel.com website). Does anyone have an explanation for such "spikey" changes, both up and down at Amazon?