$9.99 – Test Range 0.000-0.199%BAC, Model A20, Material ABS, Size L*W*H 100*28*17mm, Working Environment 0-45℃, Charging Input DC 5V, Product Name Portable Alcohol Tester, Power Interface Type-c Charging interface, Battery Capacity 200mAh, Sensor High precision sensor.
I have checked all old coupons and price is $9.99 for A20 Alcohol Tester (in Banggood). Check coupons or create price alert down below. Do you want to know what the best price is?
Latest coupon and price update (UTC):
Banggood ($9.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it expensive? Well, this price is higher than average price ($9.82)
Link: Banggood product page
Price: $9.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG990444, BGSCM11, BGXIFD218, BGCRT313, BGd7a0f7, BG0fac59, BGCAR639, BGf2f7ba, BGae6cae, BG6de04b, BGRFEBPA20, BGAMMT03, BGa92432
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
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
Price history (for all/most countries) for A20 Alcohol Tester is here. The lowest price was: $8.79.
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)).