What is the best price for SD Card? I think it is 18.99 USD (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (18.99 USD)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Is it cheap? IMHO this is a good price, coz it’s lower than average (20.25 USD)
Link: Banggood product page
Price: 18.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGe81f21, BGc209d1, BG5ac1bb, BGc66bcb, BG4e0cf4, BGa039c3, BG589b2e, BGfcade3, BG24a47d, BG55729e, BG3c5fe9, BG177b22
(probably won’t work, but you can try them out)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for BUDI 9-in-1 SD Card Reader USB 3.0 Type-C Adapter OTG is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).