The EZ-Beader (did a Google search  to get pricing) is quite expensive too at $25 per size. Of course I'm considering going from 5/8" to 3/4" tubing for inlets too, so would only need one of these tools.
(Using 3/4" tubing for both in- and outlets would make it possible to easily try series versus parallel config.)

I like the concept or the EZ-Beader! Looks like one could easily make one oneself:
Find a fitting with hex end and smooth outer surface (or weld a nut to a piece of tubing or rod); drill 4 holes (for the balls; tap inside thread in the fitting/rod/tube; grind (or turn) the tip of a bolt to conical shape.
Could probably even make a few punch marks to prevent balls from falling out.
Where does one find balls? :)

Finn

Russell Duffy wrote:

 

If you're using aluminum tubing as hose fittings, take a look at the attached picture.  This is a neat little gizmo from Earl's that forms a bead on the end of the pipe.  I just stumbled across these online yesterday, so I haven't ever tried one. 

 

Cheers,

Rusty (soon to be severed)