Just check coupons out (with price alert and history). Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
HONGDUI 100mm/4Inch Kerfmaker Table Saw Slot Adjuster Mortise and Tenon Tool Woodworking Movable Measuring Block Description | $86.09 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Maximum opening size: 100mm / 4In, Item size: 181.5 * 16 * 44.5mm / 7-1/8″* 5/8″ * 1-3/4″inch, Main color: silver+red, Max kerf width: 25 mm/ 1inch, Package size: 342*202*33mm / 13-7/16″*8*1-5/16″in, Brand: HONGDUI, Material: aluminum alloy, Package weight: 800g
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($63.74): BGHD15
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGeaf166, BGGines, BGff9ddc, BGHDW16, BG02cf64
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for HONGDUI 100mm/4Inch Kerfmaker Woodworking Table Saw Slot Adjuster is here.
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)).