You can get MT1808 AX3000 Wifi6 Wireless Dongle USB3.0 WiFi Receiver Transmitter for $18.99 using coupon code (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
MT1808 AX3000 Wifi6 Dual-band Wireless Network Cards USB Wireless Dongle USB3.0 WiFi Receiver Transmitter 5G High-speed Network Card – Black
Latest coupon code price check (UTC time):
Banggood ($18.99)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Isn’t it too expensive? From what I can see this price is higher than average price ($17.79).
Link: Banggood product page
Price: $18.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(there’s a little possibility that old coupon will 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
Do you need price history chart (for all/most countries) for MT1808 AX3000 Wifi6 Wireless Dongle USB3.0 WiFi Receiver Transmitter? There we go.
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)).