Hmm...looks like these went up by $10. A few Drop knives are significantly cheaper right now, but their original price is still shown with a strike-through line, whereas the extra $10 on these, and any other price increases I didn't catch, were just added into the listed price. This would lead me to believe the reductions are temporary and the increase(s) are not.
I've said this before, but it makes no sense to try to quietly slip a few extra bucks onto the long-standing price of an item. Someone ALWAYS notices, and the group of people who intended to buy the item but had not yet done so get very annoyed with the price hike, even if comparatively small. Instead, since secrecy is hopeless, it's much better to loudly announce the change in advance. Two weeks is about ideal, but even one week is enough for most people who were waiting to buy for whatever reason to learn of the impending change and get in ahead of it. Done correctly, companies can actually use a price increase as a sort of sale that costs nothing: as the "waiters" rush to buy they generate a little spike in business. And then instead of being annoyed because the price went up without warning, customers actually have positive feelings toward the seller for letting them know that there was a deadline to act if they wanted the lower price.