$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). Just check coupons out (with price alert and history). What is the best price?
Latest coupon and price update (UTC):
Banggood ($9.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. I think you want to know if the price is good. Well, according to CouponsFromChina database this price is the best in history (3 records).
Link: Banggood product page
Price: $9.99
Additional Banggood coupons: first page and second page
This is the best price ever noted in my database!
Old coupons (from the oldest to the newest): BGbe98b2, BG79fa09, BGWT05
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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)).