Use coupon and get EDUP HDMI-Compatible Portable Wireless Transmitter 1080P for $47.99 (from Banggood). Go down and check coupons out. Remember to check price history if it is available. What is best price?
EDUP HDMI-Compatible Portable Wireless Transmitter 1080P HD PC with TV Projector Same Screen Extension Transceiver Device
Latest price update (UTC time):
Banggood ($47.99)
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. Isn’t it too expensive? This price is higher than average price ($43.66) for this item.
Link: Banggood product page
Price: $47.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG2738e4, BG41b4f1, BGda3705, BG3e7588, BGREUPHD01
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
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 EDUP HDMI-Compatible Portable Wireless Transmitter 1080P? There we go.
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)).