Aliexpress
Click here… to search for 8192 300Mbps RTL8192CU 2.4GHz USB WiFi Adapter on Aliexpress
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
Coupon (8.25 USD): BGAFF10OFF
Coupon (8.25 USD): bGhOnEy10
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): e2bcea, TTxBG10, aff7off, BG3CSUM, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGMPB2020
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for 8192 300Mbps RTL8192CU 2.4GHz USB WiFi Adapter? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).