$21.99 – SONOFF ZB Bridge Smart Bridge Zigbee3.0 Remote Controller (Banggood, Aliexpress: SNZB-01 Wireless Switch, Wireless Connections: IEEE 802.11 b/g/n 2.4GHZ, Zigbee 3.0;, Support Sub-devices: BASICZBR3 Smart Switch, Dimension: 62X62X20mm, S31 Lite zb Smart Plug, Material: PC V0;, SNZB-02 Temp. & Hum. Sensor, SNZB-04 Wireless Door/Window Sensor., SNZB-03 Motion Sensor, Input: 5V 1A; (the best price with coupon)).
I am monitoring price for SONOFF ZB Bridge Smart Bridge Zigbee3.0 Remote Controller and it is for $21.99 now (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($21.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Good or bad price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $12.05)
Link: Banggood product page
Price: $21.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGSONOFF15, BGSONOFFZBB, BGSNZBBZ, BGESSONOFF1, 13f142, BGVKSOZB, BgcLuBofErtA10, BGHU0147, BGZB13, BGSNZBBR, BGSONOFF16, BGAFF10OFF, BGSTHO15, BGSON149, BGHONEY2110, BGSHOM15, BGSHE15, BG93de6d, 6GSGIT, BGSmart6, BGHU1717, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, BG15Sonoff, BG8ReviTrage, Cuponation9, 9OFFSUMMER, BGd187f7, BG2f6dea, BGf6926e, BGb02ae3
(you can check these old coupons out, but these probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for SONOFF ZB Bridge Smart Bridge Zigbee3.0 Remote Controller is here. The lowest price was: $8.99.
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)).