$16.99 – SONOFF D1 Smart Dimmer Switch (Banggood, Aliexpress: Model: D1, RF band: 433.92Mhz, Enclosure material: PC V0, Output: 100-240V AC 50/60Hz, Input: 100-240V AC 50/60Hz, Dimension: 62*47*32.5mm, Wi-Fi: IEEE 802.11 b/g/n 2.4GHz, Dimmable LED: 150W, Incandescent bulb: 200W, Max. current: 1A (the best price with coupon)).
What is the best price for SONOFF D1 Smart Dimmer Switch? I think it is $16.99 (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($16.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it good price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $9.62)
Link: Banggood product page
Price: $16.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): elec, BGTT10, bGhOnEy10, BGSMOFF, BGSONOFF15, BGELIG0920, 13f142, BgcLuBofErtA10, BGSONOFFD1, BGSONOFF16, BGAFF10OFF, BGSTHO15, BGCuponation10, BGHONEY2110, BGSHOM15, 6GSGIT, ADMITAD2212, BGSmart6, BGe8f407, MVC8SPRING, 2203ActiesNL, BG15Sonoff
(probably won’t work, but you can try them out)
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
Do you need price history chart (for all/most countries) for SONOFF D1 Smart Dimmer Switch? There we go. The lowest price was: $9.34.
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)).