I have just checked coupons. The lowest price I could get is 20.27 USD for Wrenches and Carbide (in Banggood). Just check coupons out (with price alert and history). What is best price?
Latest coupon code price check (UTC time):
Banggood (20.27 USD)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. But wait a sec… Is it a good price? The average price for this item is 29.52 USD, so I think it’s a good price!
Link: Banggood product page
Price: 20.27 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG4eb765, Couponsde7, BGGines, BGTools8, BGMCT01, BGTACC18
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for 7pcs 10mm Lathe Turning Boring Bar Tool Holder with T8 Wrenches and Carbide Inserts on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 7pcs 10mm Lathe Turning Boring Bar Tool Holder with T8 Wrenches and Carbide Inserts.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).