$9.99 – QC3.0 USB Output: 4.5V/5A /5V/4.5A /9V/3A /12V/2.5A max, LED light color: Blue /Red /Green(optional), Product material: ABS, Size: 5.4X3.7X2.9 cm, Product Color: Black, input Voltage: DC 12V-24V, Type C PD Output: 5V/3A /9V/3A /12V/2.5A /15V/2A /20V/1.5A max.
Latest update shows that 12-24V 48W Dual USB Car Charger costs $9.99 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood ($9.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… But wait a sec… Is it a good price? The average price for this item is $10.49, so I think it’s a good price!
Link: Banggood product page
Price: $9.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG253d88, BGCarEle4, BG421c45, BGb3bdda, BG5549c0, BG997246, BGGRJAN2901, BGCarEle5, BGc9787e, BGLMQ15, BGSCM11, BGAMMT03
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 12-24V 48W Dual USB Car Charger. The lowest price was: $7.99.
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)).