I have built two of them, one for me (pictured) and another one for Zig.
You pay for the parts, shipping, and a little for my time.
I will make you a bundler.
I just finished re-configuring this machine to a mechanical engage on the motor. I ran it for years with just a switch to start the motor. the starting switch is wearing out (wrap 5000 bundles a year, lots of "starts") so I used a back side idler on the belt. Works like a dream now.
let me know, and I can start pricing parts.
motor, gear drive, belt, make the pulley. couple flange bearings. some square tubing, miscellaneous bits.
it isn't really all that complicated