Buy Add-on Items
Add-on Items are low-priced products for sale on Amazon that can be purchased as long as you're ordering at least £20 of eligible products, excluding gift cards.
To buy Add-on Items:
Look for the Add-on Item badge
while shopping on Amazon.co.uk or the blue title bar around Add to Basket.
Include the Add-on Item in an order that includes £20 or more of items fulfilled by Amazon.co.uk (including items sold by other Sellers and fulfilled by Amazon). This order can include a mix of Add-on Items and other items fulfilled by Amazon, or be entirely made up of Add-on Items, but cannot include gift cards.
For example, you could order a £3 keyring that's an Add-on Item with a book at £17, or anything else that gets your order to £20 or more of items which are dispatched by Amazon.