$21.99 – Screen size 3.76in, Product name Vehicle HUD head-up display, Input signal GPS, Applicable models Universal For Car, Model G9, Compatibility Strong, Screen type LED, Material ABS+PC, Resolution HD, Display function Speeding alarm/driving direction/time/driving distance/driving time/100km acceleration/satellite number/fatigue driving reminder.
I have checked all old coupons and price is $21.99 for G9 Auto HUD GPS Head Up Display (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest price update (UTC time):
Banggood ($21.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? But wait a sec… Is it a good price? From what I can see this price is higher than average price ($17.59).
Link: Banggood product page
Price: $21.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGSCM11, BGCAR639, BGe4e17b, BGAMMT03
(these coupons are old, so probably won’t work)
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
Do you need price history chart (for all/most countries) for G9 Auto HUD GPS Head Up Display? There we go. The lowest price was: $13.39.
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)).