When I was updating this page, then coupon price was 22.49 USD for G2 GPS HUD Head (in Banggood). Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood (22.49 USD)
Banggood warehouse is located in China. Is it a reasonable price for this item? Well, this price is higher than average price (21.62 USD) There is one coupon right now! Check this out.
Link: Banggood product page
Price without coupon: 24.99 USD
Coupon (22.49 USD): BGAMMT03
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGSCM75, BG589b2e, BGSCM11, BGCAR639
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for GEYIREN G2 GPS HUD Head Up Display on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for GEYIREN G2 GPS HUD Head Up Display.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).