Amazon.com : Akiles ARC-L41 RubiCoil Coil Punch and Inserting Equipment, Punches Up to 10 Sheets of 20lbs Bond Paper, 6mm or 4:1 Pitch, Side Margin, Waste Drawer, Round (4mm Diameter) Hole Punch :
ONYX OD4012 Electric Punch With Die Included by Rhin-O-Tuff - Unbeatable Price For its Performance - Delran Business Products
Scrapbook Paper Shapers Medium Paper Punch: Spiral - Walmart.com