Amazon prices are constantly changing. I have had those changes work in my favor at times and work against me at other times. From what I gather, the price you are going to pay isn't set until you actually place the order.
I use CamelCamelCamel to view pricing trends before I buy anything. If it has been sold for significantly lower recently, I wishlist it and set up an alert on CCC and then buy it eventually. If its within 5% or I need it immediately then I just suck it up.
Also, different sellers can price stuff differently (obviously) so check to make sure its the cheapest seller for the item too - I mainly do FBA now versus directly from Amazon.
I use CamelCamelCamel to view pricing trends before I buy anything. If it has been sold for significantly lower recently, I wishlist it and set up an alert on CCC and then buy it eventually. If its within 5% or I need it immediately then I just suck it up.
Also, different sellers can price stuff differently (obviously) so check to make sure its the cheapest seller for the item too - I mainly do FBA now versus directly from Amazon.
It could also be that Amazon ran out of the item, and now it's from a different seller? Seems more likely given the magnitude of the jump.
Although would think in that case that they would notify you of that situation.
Amazon is constantly advertising its own credit card by showing the credit you would get for signing up (which seems to vary per person) when you check out.
Is it possible you weren't looking at the actual price of the product but rather the price after the credit you would get if you signed up for their card? That credit would vanish after you added your own card.
-KeithP