You can get EDUP HDMI-Compatible Portable Wireless Transmitter 1080P for $45.99 with coupon (from Banggood). Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
EDUP HDMI-Compatible Portable Wireless Transmitter 1080P HD PC with TV Projector Same Screen Extension Transceiver Device
Latest coupon and price update (UTC):
Banggood ($45.99)
Banggood warehouse is located in China. There are no coupons available at this moment in Banggood. But wait a sec… Is it a good price? Well, this price is higher than average price ($43.66)
Link: Banggood product page
Price: $45.99
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
(you can check these old coupons out, but these probably won’t work)
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
Check out price history chart (for all/most countries) for EDUP HDMI-Compatible Portable Wireless Transmitter 1080P.
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)).