$9.99 – Woodworking T-Type Pocket Ruler Aluminum Slide Ruler 6.3in / 7.9in / 11.8in Precision Scribing Ruler Tools with Sliding Stops Inch and Metric – #D.
I have just checked coupons. The lowest price I could get is $9.99 for Woodworking T-Type Pocket Ruler Aluminum Slide Ruler (in Banggood). Price history, coupons and price alert are available on this page. What is the best price?
Latest coupon code price check (UTC time):
Banggood ($9.99)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Is it a reasonable price for this item? Actually this is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: $9.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGbe98b2, BG79fa09, BGWT05
(these coupons are old, so probably won’t 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 Woodworking T-Type Pocket Ruler Aluminum Slide Ruler. The lowest price was: $9.99.
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)).