Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
WorthWhile Sports Kneepad Pressurized Elastic Knee Pad L | 4.89 USD | – |
More on Aliexpress… Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (18.54 USD): BGHB218
(CouponsFromChina.com tip: just apply this code 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): BGXPJA192, BGHealth10D, 2022ACTIESNL
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Pressurized Elastic Knee Pads Pair.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).