Basically copy coupon, view price history or create e-mail price alert. Best price?
Dimension 93.8mm*30.2mm*13.4mm(W X D X H), Button WPS button, Wireless Standards IEEE 802.11ac / IEEE 802.11a /IEEE 802.11n / IEEE 802.11g / IEEE 802.11b, Frequency “5GHz
2.4GHz”, Antenna PIFA Antenna, Modulation Technology DBPSK / DQPSK / CCK / 16-QAM / 64-QAM / 256-QAM, Transmit Power <20dBm (EIRP), LED indicator 1* System LED, Wireless Security WPA-PSK/WPA2-PSK /WPA/WPA2 /WEP /WPS, Interface USB3.0, Signal Rate "11n: Up to 400Mbps(dynamic)
11ac: Up to 867Mbps(dynamic)", Certification CE / FCC / RoHS /EAC
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it?
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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG00c906, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGWSCYT1, BG877e00
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Tenda U12 AC1300 USB3.0 Wireless Adapter.
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)).