Shell color: black, Support network: 2.4G, Material: ABS, Product size: about 58*30.6*10.5mm/2*1.20*0.41inch, Voltage: 5V2A, Interface type: HDMI/Micro USB, Color box size: 120*90*22mm/4.72*3.54*0.87inch, Product packaging weight: about 54g, Chip: AM8268.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
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 price update (UTC time):
Banggood
Banggood warehouse is located in China. I have no active coupons for you right now.
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): BG589b2e, BGProjcc
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Wireless Display Dongle Adapter 1080P. The lowest price was: $10.99.
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)).