You can get ES-5 Aluminum for 8.99 USD with coupon (from Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (8.99 USD)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Is it a reasonable price for this item? 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): BG10WLRC, BGWT15, BGWDT15
(these coupons are old, so probably won’t work)
Aliexpress
Click here… to search for ES-5 Aluminum Alloy Woodworking Scribing Ruler 3D Miter on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for ES-5 Aluminum Alloy Woodworking Scribing Ruler 3D Miter.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).