You can get 4-12/20/32mm HSS Step Cone for 8.99 USD with coupon (from Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Latest coupon code price check (UTC time):
Banggood (8.99 USD)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… I think you want to know if the price is good. Awesome! This price is the best in CouponsFromChina database!
Link: Banggood product page
Price: 8.99 USD
8.99 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG6952, BGDRB18, BGUS6952A, BGherra, BGd00e93, BGa6da92, BANGGOODSD, 6GSGIT, 00c906, BGGines, BGTools8
(these coupons are old, so probably won’t work)
Aliexpress
Click here… to search for Drillpro 3pcs 4-12/20/32mm HSS Step Cone Drill Bit on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Drillpro 3pcs 4-12/20/32mm HSS Step Cone Drill Bit is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).