writes "Amazon secretly canceled orders for a large jazz CD set after realizing that it had mis-priced the item at $31 instead of its MSRP of $499. At first, inventory shortages caused the online merchant to string customers along for over a month after they placed their orders. But when Amazon realized that the box set was under-priced by $470, it simply erased all records of customers' order in their account history. No emails were sent to customers informing them of the price change or of the order cancellation. Probably because it violates Amazon's highly publicized price guarantee policy. A customer who called to complain and request the CD set at the $31 price was given a $20 discount off of his next Amazon order."
A caveat: there is no external confirmation that Amazon did what is claimed here.