When I was updating this page, then coupon price was 8.99 USD for Finder Tool (in Banggood). Just check coupons out (with price alert and history). What is the best price?
Latest price update (UTC time):
Banggood (8.99 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it cheap? Current price is the lowest in history (according to CouponsFromChina database)!
Link: Banggood product page
Price: 8.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Aliexpress
Click here… to search for Small Square Center Finder Tool 50x100mm on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Small Square Center Finder Tool 50x100mm.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).