$22.99 – 3PCS High-Speed Steel Step Drill Bit Set M35 Cobalt HSS Hex Shank 1/8″ to 7/8″ Multi-Size for Metal Wood Plastic Stainless Steel Aluminum – 3PCS.
You can get 3Pcs High-Speed Steel Step Drill Bit Set M35 for $22.99 using coupon code (in Banggood). Just check coupons out (with price alert and history). What is best price?
Latest coupon and price update (UTC):
Banggood ($22.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Low/high price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $21.89)
Link: Banggood product page
Price: $22.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGbe98b2, BG79fa09
(these coupons are old, so probably won’t work)
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.
Price history and price alert
Check out price history chart (for all/most countries) for 3Pcs High-Speed Steel Step Drill Bit Set M35. The lowest price was: $20.79.
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)).