I am monitoring price for 2Pcs Workbench Dog Hole Clamp Set With Anti-Slip Pad and it is for $20.99 now (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
2PCS Workbench Dog Hole Clamp Set With Anti-Slip Pad Woodworking Desktop Fixed Clip Aluminum Alloy Quick Acting Hold Down Clamp For 19mm 20mm Dog Hole Tool – 19mm
Latest coupon and price update (UTC):
Banggood ($20.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $18.60)
Link: Banggood product page
Price: $20.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGWDT15
(these coupons are old, so probably won’t work)
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
Price history (for all/most countries) for 2Pcs Workbench Dog Hole Clamp Set With Anti-Slip Pad 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)).