Aliexpress
Click here… to search for VIOFO A129 IR Duo Dash Cam on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (161.99 USD): BGSABAUM26
Coupon (161.99 USD): BGHONEY2110
Coupon (170.99 USD): 7bcdf9
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BgAuMotor, BGVIOFOIR, BGVIOFOA129IR, bgaumotor, BGNEWestDVR, BGVIOFO00, BGDVIOFO, BGCFCA129, BGirDVR, BGA129IRPL, BGCar1val, BGBINKUPON339, BG1111CAR, BGpage7470, BGAFF10OFF, BGCS10, BGSP63, BGVIO39, bgshOOp10, BGCARPRO, BgoFErTaSchInA10, BgcLuBofErtA10, BG4555, BGVIOFO256, BGJP40339, BGVIOFOVIR
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for VIOFO A129 IR Duo Dash Cam.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).