Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (13.04 USD): BGAFF10OFF
Coupon (13.04 USD): BGNDS10OFF
Coupon (13.04 USD): BGCuponation10
(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
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BGN170u5, BGN470D, BGTT10, bGhOnEy10, BGN570H, BGSS10%SW, BgoFErTaSchInA10, BgcLuBofErtA10, BGb33493
(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 Kingstick XC-USB-KK-33 64GB Flash Drive.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).