Ibiwires are a nifty idea in that they are made with 21 loops, the same as plastic combs; so the same punch will work for both. Packs of 100.
Renz Binding Wires A4 34 Loop 3:1
Presco Binding Wires A4 34 Loops 3:1
Presco Binding Wire Spools - 3:1 Pitch
Renz Binding Wires A4 23 Loop 2:1
Plastic Binding Covers