Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
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 code price check (UTC time):
Color Black, Interface USB 3.0, Chipset Realtek 8812BU, Antenna Type 2dBi antenna, Wireless Standards IEEE 802.11ac / IEEE 802.11a / IEEE 802.11n / IEEE 802.11g / IEEE 802.11b, Size 42 * 19 * 9mm, Frequency 2.412~2.484GHz/5.15~5.825GHz, Model 6B14, Material ABS material + USB iron head
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($16.92): 8Couponsde
2. ($17.10): Terence
3. ($17.10): 2203ActiesNL
4. ($17.29): BG00c906
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 00c906, ADMITAD2212, 2022ACTIESNL, Tabby20, BG1efeb0
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for 1300Mbps USB3.0 WiFi Adapter 802.11ac.
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)).