Basically copy coupon, view price history or create e-mail price alert. What is best price?
Dual-band 2.4GHz + 5.0GHz 1 1000M WAN + 3 1000M LAN MiWiFi App Control + 4 Antenna
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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($238.49): bGhOnEy10
2. ($238.49): BGSS10%SW
3. ($238.49): BGAFF10OFF
4. ($238.49): BgcLuBofErtA10
5. ($252.99): BG11PP12
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): f04e87, e2bcea, TTxBG10, aff7off, Wholesale20, BGss11, BG3CSUM, BGPAYPALSS, bgssaff9, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGNG1203VZ, BGN1203ZM3, BGN103ymb, BGN103gt, BGVDay10%off, BGSPR, BGTT10, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, 7bcdf9, BGNDS10OFF, BGCuponation10
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Xiaomi Mi R3P 2600Mbps Router Pro ($-3)
2. Europe – Xiaomi Mi R3P 2600Mbps Router Pro [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi 2600Mbps 1TB Wireless Router HD.
Price records source(s): Gearbest, 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)).