You can get 12-24V Triple USB Car Charger for $7.99 with coupon (from Banggood). Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
12-24V Triple USB Car Charger Socket QC3.0 & Two PD3.0 With ON/OFF Independent Switch Fast Charging Adapter – Blue Light
Banggood ($7.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… Is it good price? Well, this price is higher than average price ($7.49)
Link: Banggood product page
Price: $7.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAMMT03
(there’s a little possibility that old coupon will work)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for 12-24V Triple USB Car Charger.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).