Aliexpress
Click here… to search for 40Pcs Metric Tap Wrench Die Pro Set M3-M12 [EU] on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I can’t tell you if this price is good – not enough records in my database, so I won’t judge. One coupon is available. Cool!
Link: Banggood product page
Coupon (24.97 USD): BGGines
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BGHT15, BGPHOOL8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Not enough data to show price history chart… 19.43 USD is the only recorded price. It was not cheaper than that since we have saved it in DB.
You can set price alert (for Banggood).