Reddit mentions of Akiles WireMac-31 Model AWM31 Wire Punch & Binding Equipment, 3:1 Pitch, All 40 Disengaging Dies, Square (0.157″ x 0.157″) Hole Punch, Heavy-Duty, 20 sheets single punching capacity (20 lbs paper)

Wire binders are fairly simple machines - the only real question is how many pages you'd like to be able to bind.

Standard wire binds up to 120 pages are done with a 3:1 loop pitch (three holes per inch). These are the most common binders sold for home use.

Binds from 121 to 280 pages are done with a 2:1 loop pitch, so you can't just add more pages and shove a new bind onto your pages.

Home machines are designed for use with precut lengths (3:1 are 34-loop and 2:1 are 23-loop) that you should be able to source from any office stationer.

You can buy home-use machines that will do both 3:1 wire and 21-hole plastic spiral binds in one. The most common machine for precut binds are manual, meaning you can have to operate it by tugging a handle to do the punching and the clamping - there are more expensive electric machines that will do the punching at the press of a button.

Probably the best idea is to find a machine with adjustable pins. These will let you pop out various dies so you can punch custom sized paper without leaving half-holes at the ends. Most of the cheaper machines don't do this and you'll run into problems if you want to offer custom sizes.