Dims(W*D*H): 52*47*18mm(without clip), WiFi frequency: 2.4GHz-2.4835GHz WiFi, RF frequency: 433MHz /encoding 1527, Case temp: Tc +80℃(Max.), Voltage: 90-250V AC 50/60Hz, Power Load: 500W(Max.), Operation range: ≤200m, Product type: WiFi Curtain Module, Current: 2A, Operation temp: -10℃-+40℃, IP rating: IP20.
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood).
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG1679938, 6GSGIT, BGSmart6, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, Cuponation9, 9OFFSUMMER
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – MoesHouse MS-108WR WiFi RF Smart Curtain Blinds Module [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for MoesHouse MS-108WR WiFi RF Smart Curtain Blinds Module. The lowest price was: $8.65.
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)).