You can get this Noise Canceling Gaming Headset for £1.99, reduced from £21.99.
If you go to the product page, there's a promotion offer "Buy 1 to get £20 Off"
Press this to redeem the offer, then add to basket and proceed to checkout.
At the pay screen, you'll see it the discount was applied making this just £1.99.
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thats another christmas present in the bag for £1.99 
https://www.amazon.co.uk/dp/B01N7ACBVG/ref=pd_sbs_23_3?_encoding=UTF8&psc=1&refRID=J4A2VWJ2WP11Q59NYETS These also suffer the same glitch, £3.08 after promo applied
EDIT: Looks like the seller has realised whats going on 
It should just be in a 'pending state' in your bank and refunded to you soon. For more information read this:
https://www.amazon.co.uk/forum/deals?_encoding=UTF8&cdForum=Fx1DEIHNWYF5SA9&cdThread=Tx29OSO145AWDTA
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