Aliexpress
Click here… to search for Polyimide Tape 12mm 33m on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (13.08 USD): BGherra
(CouponsFromChina.com tip: this code has to be applied 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): 502C6B, 20tools, TTxBG10, 2019SPEDM, bgssaff9, AFfbG10, BGELE2, BGBFAFF2019, BGCITYADS2019, BG2020NS, BGAFF7OFF, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGEES11, BgoFErTaSchInA10, BgcLuBofErtA10
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Polyimide Tape 12mm 33m.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).