There was a very brief error on Amazon UK's site that saw thousands of sales of third-party goods that were sold for just $0.01, with the glitch originating from Amazon Marketplace's Repricer Express between 7-8PM GMT on December 12.
Amazon issued a statement about the problem to Sky News shortly after the error took place, saying "we are aware that a number of Marketplace sellers listed incorrect prices for a short period of time as a result of the third party software they use to price their items on Amazon.co.uk". The retail giant has announced that most of the orders that were placed, have since been cancelled.
The piece of software in question is a subscription service that monitors Amazon pricing continuously for the lowest price, and then sets sale prices on items that a user sets as something they're after. Up to 60,000 item prices can be changed per hour, with the constant re-pricing there to maintain the lowest prices to give a seller the best change of being in Amazon's prized "More Buying Choices" box.