You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
802.11ac, Simultaneous dual-band networks – 2.4GHz (300Mbps) and 5GHz (867Mbps), Four external antennas, MT7621A MIPS processor, 128MB SLC Nand Flash ROM, 128MB DDR3 RAM, Speed of Ethernet Port: 1000Mbps
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. ($44.99): BGNDS10OFF
2. ($48.99): 13f142
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): f016ad, Mi4BR, 58742b, 502C6B, TTxBG10, aff7off, AFfbG10, BGww31, BGGJG7CN, BGzyGJG7, BGxm825A, BG10R4, BGJIO7Fj85, BGYb825xM6, BGguir596f, BGBFAFF2019, BGNH525GC, BGN1225EF, BGMIROU, BGNZM25Q1, BGN1225bh, BGN125cE, BGN125ymh5, BGN221V, BGRUTRA, AFfbG10,, BG3N8B, BGRSNW12, BGN325XC, BGRU4RA, BGAFF10OFF, bGhOnEy10, BGdragonBoat, bgshOOp10, BGN921F, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGHONEY2110, BGc367c4, BANGGOODSD, 00c906
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Mi Router 4 1000Mbps LAN [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mi Router 4 1000Mbps LAN.
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)).