Aliexpress
Click here… to search for 50 pcs. 1/1.5/2/2.5/3mm HSS Titanium Coated Drill Set [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. This is new product in my database, so I don’t know if this price is good. We have found one coupon for this product!
Link: Banggood product page
Coupon (5.03 USD): BGGines
(CouponsFromChina.com tip: you should apply the coupon 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): BgcLuBofErtA10, BGBITS888, BGAFF10OFF, BGCuponation10, BGHONEY2110
(probably won’t work, but you can try them out)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 3.99 USD.
You can set price alert (for Banggood).