When I was updating this page the price was 9.23 USD for Xiaomi KACO (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Latest coupon and price update (UTC):
Banggood (9.23 USD)
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. Price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 4.55 USD)
Link: Banggood product page
Price: 9.23 USD
Old coupons (from the oldest to the newest): TTxBG10, BGMLGelPens, BGML8Pcs, bgssaff9, BGML47D, AFfbG10, BGBFCR01, BGCITYADS2019, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGGP910, BgoFErTaSchInA10, BGWWN05, BgcLuBofErtA10, BGHONEY2110, BANGGOODSD, 6GSGIT, 00c906, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi KACO Colorful Gel Pens 0.5mm 8Pcs [EU] (-3 USD)
Aliexpress
Click here… to search for Xiaomi KACO Colorful Gel Pens 0.5mm 8Pcs on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Xiaomi KACO Colorful Gel Pens 0.5mm 8Pcs is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).