Amazon has always applied the lowest price at the time of billing on my orders. I'm not sure if this is due to my Prime membership or not.
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I'm not a prime member so I'm not sure what happens normally. I did get a reply from them just a while ago:
Dear Customer
We are definitely interested in an attractive pricing policy for you. This means that we always try to offer items in our shop at very special prices. Please note that once the order has been confirmed you have accepted the shown amount and therefore have agreed on the price offered by us.
However, under the circumstances, I have changed the price of the item manually to EUR 216.64 as an exception.
So an extra €3 in my pocket. Now I'm hoping they'll start processing it tomorrow.