Just check coupons out (with price alert and history). Let’s see what best price is ATM.
2500 lumens brightness, 1000: 1 contrast ratio, 1.8 to 5m projection distance, Native Resolution: 1280x 800
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
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Liandlee Car Head Up Display HUD For Audi Q3 Q5 Q7 SQ5 2010-2018 Dynamic Driving Computer HD Projector Screen OBD Detector | $64.46 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Price history (for all/most countries) for Q7 Projector EU Plug White is here.
Price records source(s): Gearbest
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)).