Aliexpress
Click here… to search for 3x ASUS LyraTrio Mesh WiFi AC1750 System on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
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): BGf8a714, BGNDS10OFF, BGHONEY2110, 7bcdf9, 00c906
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for 3x ASUS LyraTrio Mesh WiFi AC1750 System is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).