Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi WiFi Router 3G [Fast-23].
Price records source(s): Gearbest
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You can set price alert (for Banggood).