So in the space of twenty-four hours, Amazon's price for this certain box of Planter's Salted Cashews has gone from $17.09 to $21.98 and then to $24.11…and now it's at $28.99. The last time I purchased them, they were $15.06 and the time before that — not that long ago — I paid $11.24. You can check on the current price here.
I'm going to stop tracking this because I've made my point: Some items on Amazon just go up in price and down in price rapidly and for no visible reason. If a couple of bucks matter to you, you have to keep your eye on this.
I've received a number of interesting e-mails from folks telling me how to track prices on Amazon,. I'll post some of it in a few days. My thanks to all who wrote in.