Xiaomi FREETIE EVA Shock Absorption Insole (Banggood, Aliexpress: Item Xiaomi FREETIE Insoles, Sports Shoes, Material TPU, EVA, 43-44, Upper material 100% Polyester, 41-42, Size 39-40, Csual Shoes, Suitable For Leather Shoes (the best price with coupon)).
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. I found coupon for you. Check this out.
Link: Banggood product page
1. ($15.19): BG00c906
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): e2bcea, 600fa9, TTxBG10, BGSMB5, AFfbG10, bGhOnEy10, BGCS5227, BGRSHOES, BGXIAOMI10TH, BGwhielabel, BG10OFFAFF1, BG4d9120, BG1074d6, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGeb5395
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Xiaomi FREETIE EVA Shock Absorption Insole is here. The lowest price was: $5.89.
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)).