Some of these items, like the pasta, are things I'd previously ordered from Amazon for a fraction of the current price. Which, again, has caused me to be much more cautious—every time I reorder something nowadays, I have to check whether the price has changed. How does Amazon expect people to use stuff like the dash button when prices can vary this much?
But the products that double in price have made more sensitive to the ones that change by a few dollars, because I'm now on high alert for price changes in general.
I have a couple of Dash buttons for Gatorade and pistachios and such. I stopped using them because I couldn't be certain of a reasonable price, or that the products wouldn't be fakes.
Safety > price > convenience, Amazon.
I think it all stems from the same thing. Dishonest Amazon sellers know that most Amazon shoppers don't price check, so they can all get away with selling way over market price as long as everyone selling a given item stays the course.
Last week I tried Mercari, and it was... OK. Better selection than Goodwill. The shippers don't seem to be in a hurry to get things out. Both sellers offered excuses when they missed Mercari's three day window. But the stuff finally got here.
Can anyone recommend another marketplace? Something not Alibaba or DX.com?
For out-of-print books/toys/games/etc., eBay is usually your best bet. Computer hardware (video cards, RAM, etc.) is often cheaper on either eBay or NewEgg. Et cetera.