I am monitoring price for 3pcs Aluminum Alloy Precision Pocket Ruler and it is for $11.99 now (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Latest coupon and price update (UTC):
3pcs Aluminum alloy Precision Pocket Ruler Woodworking Positioning Scribing Gauge Carpenter Markinig Ruler
Banggood ($11.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? The question is – is it a good price? It looks like it’s a good price (lower than average ($12.49)).
Link: Banggood product page
Price: $11.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG4b7c47, BG7acc17, BGf74553, BG4f0070, BGDBI044, BG6e5da5
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for 3pcs Aluminum Alloy Precision Pocket Ruler? There we go.
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)).