You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Read Speed: 100MB/s, Write Speed: 40MB/s, 256G, Capacity: 64G, 128G, Model: P500 Pro, Speed Class: V30 UHS-I U3
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG17a931, TTxBG10, BGeb9f26, aff7off, bgssaff9, BG5cf727, AFfbG10, BGQWER265, BGLK5FC, 502C6B, BGNU9G7KL, BGlK24532O, BGBFAFF2019, BGNgyro8a, BGCITYADS2019, BGGIUFFYIH, BGN1245LM, BGN145th6, BGVDay10%off, BGN245E, 7d18f7, FBCOUPON1, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGNDS10OFF, BGCuponation10, 13f142, BGHONEY2110, BANGGOODSD, 6GSGIT, BG00c906
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – Netac P500 PRO U3 64GB MicroSD Card ($-3)
2. China – Netac P500 PRO U3 256GB MicroSD Card ($-3)
3. Europe – Netac P500 PRO U3 64GB MicroSD Card [EU] ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for Netac P500 PRO U3 128GB MicroSD Card? 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)).