<human>: Can you condense the text into three sentences or less?

So I was subscribed to get a few packs of [these pecans] once a month. They used to cost $11.12 per two-pack with the Subscribe & Save discount. As you can see, they now cost $17.20 per two-pack. I was never notified of this until I received my most recent shipment and my card got charged the increased price. 

I was under the assumption the original price was locked in, but I was wrong and that's my fault for not being aware of the terms. However, you'd think a company like Amazon could manage to alert people when there is over a 50% increase to the price of something before charging them. 

But, the real problem comes in that **Amazon can change the price at any time before the product ships**. So, for example, if you checked that the price was the amount you wanted to pay two days before your product was due to be shipped, Amazon could change it the next day and you would have to pay the increased price. If you checked 2 hours before your product shipped, Amazon could change the price in the 30 minutes before it shipped and you would be charged the increased price. I guess it's a really good way to get one more shipment out of people before everyone cancels due to the ridiculous increase, but seems like a pretty shitty thing to do.
<bot>: Don't use Subscribe & Save from Amazon unless you have the free time to refresh the product page every second until your item ships to make sure they don't increase the price right before the shipment.