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.
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 coupon code price check (UTC time):
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
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 00c906, ADMITAD2212, 2022ACTIESNL, Tabby20, BG1efeb0
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for 1300Mbps USB3.0 WiFi Adapter 802.11ac is here. The lowest price was: $16.55.
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)).