I have just checked coupons. The lowest price I could get is $10.99 for 450mm Aluminum Alloy Rail Miter Bar Slider Table Saw Gauge Rod (in Banggood). Get coupons, create price alert or check price history out! Best price?
Width: Approx. 19mm, Package weight: 227g, Color: Silver, Material: Aluminium Alloy, Length: Approx. 450mm, Thickness: Approx. 9.5mm
Latest coupon and price update (UTC):
Banggood ($10.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? I think you want to know if the price is good. According to my database, the average price is $12.49 and current price is $10.99, so it’s probably a good price!
Link: Banggood product page
Price: $10.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG10WLRC, BGWT15, BGWDT15
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 450mm Aluminum Alloy Rail Miter Bar Slider Table Saw Gauge Rod [EU] ($-3)
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
Here is price history (for all/most countries) for 450mm Aluminum Alloy Rail Miter Bar Slider Table Saw Gauge Rod.
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)).