Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
SeaKnight TriPoseidon 4 Strands 300m PE Braided Fishing Line | 3.80 USD | – |
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (13.25 USD): BG589b2e
(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): BG4d9120, BG55472a, 00c906, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG7d9070, BG8a8bef, TTSUMMER8, Cuponation9
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for SeaKnight 300m Tri-Poseidon Japan PE Spectra Braided Fishing Line is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).