Don't spend too much for it.   

I just purchased a very nice one for a friend who doesn't do e-bay (Chevy Vertex with cap and wires delivered for $320.00).

He is going to replace bottom housing and the drive to make it fit a Hemi (cheeper for us to get one for a Chevy and change it over, than to find one for a Hemi). 

When you get it be sure to spin the shaft quickly to make sure everything spins free     

Lotsa different kinds and prices out there, what are we talkin about? My Msd Mag would run ya 2 g's and it's the baby one (12 Amp). A decent sprintmag may be had for a hundo or two. Some mags are self contained, some have TRANSFORMERS (not coil) and some dont. Some are for short runs only and some are for undurance.

Im not sure make or model just a buddie that has one and knows i need a distributor hit me up