Check this low price: $5.99 from Banggood. 8PCS Workbench Peg Brake Stops Clamp 19mm 20mm EVA Rubber Bench Dog Woodworking tool for Workbench Holes Anti-Slip – 20mm.
Updated:
Banggood
Warehouse in China.
Link: 8Pcs Workbench Peg Brake Stops Clamp 20mm
Price: $5.99
Additional Banggood coupons:
1. First page
2. Second page
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
Do you need price history chart (for all/most countries) for 8Pcs Workbench Peg Brake Stops Clamp 20mm? There we go. The lowest price was: $4.99.
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)).