You can create price alert here, copy coupons and view price history. What is the best price?
1x User Manual, 2x USB-C Cable, 1x 5V/2A USB Cable, 2x Fopo PD1303D Portable Monitor(Other products are not included), 2x HDMI Cable
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($423.19): BG8OFFCOUPON
2. ($423.19): TTBLACK5
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGFopo043, 2203ActiesNL, BG1efeb0, MVC8SPRING, BGAL623, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, BGROTTERlU, pROMo8cuPoN, BGROTTERI45, hoNEYbGdeAlS, BGJUNEGSG9, Cuponation9, BGVSUTR
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Fopo PD1303D Dual Portable IPS Monitors 13.3 inch 1920×1080 [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for Fopo PD1303D Dual Portable IPS Monitors 13.3 inch 1920×1080 is here.
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)).