19.99 USD – that is current price with coupon for 5V/12V Three-Head Car (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (19.99 USD)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Price? Good news! This is great price, coz it’s the lowest in CouponsFromChina database!
Link: Banggood product page
Price: 19.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGLMQ15, BGSCM11, BGAMMT03
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for 5V/12V Three-Head Car Fan.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).