$6.99 – 7Pcs 3mm-10mm HSS Countersink Drill Bit Set (Banggood, Aliexpress: 7PCS 3mm-10mm HSS Countersink Drill Bit Set Reamer Woodworking Chamfer Drill Counterbore Pliot Hole Cutter Screw Hole Drill (the best price with coupon)).
7Pcs 3mm-10mm HSS Countersink Drill Bit Set is for $6.99 (in Banggood). You can create price alert here, copy coupons and view price history. What is the best price?
Latest coupon code price check (UTC time):
Banggood ($6.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. Price? Well, according to CouponsFromChina database this price is the best in history (4 records).
Link: Banggood product page
Price: $6.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BG20236Tool, BG589b2e
(there’s a little possibility that old coupon will 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 7Pcs 3mm-10mm HSS Countersink Drill Bit Set. The lowest price was: $6.99.
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)).