I am monitoring price for G9 Auto HUD GPS Head Up Display and it is for $13.99 now (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Latest coupon and price update (UTC):
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
Banggood ($13.99)
Banggood warehouse is located in China. I have no active coupons for you right now. The question is – is it a good price? It’s a good price, isn’t it? The average is $17.59.
Link: Banggood product page
Price: $13.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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
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.
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)).