CHGeek Car 12v Cigarette Lighter Splitter and Free Quickcarge 3 USB C Car Charger £9.99 (Prime) / £13.98 (non Prime) Sold by Maniceteen and Fulfilled by Amazon.

Click on link and hover your mouse over "Promotion Message" and click the first "Add both to basket" link.
Will show as £18 in basket but once you click checkout the price will drop to £9.99 for both. Expires at 12.30pm. (20 mins from time of posting....)