Air Pump prices

[mil76@juno.com (John I Miller)]

        Can anyone give me an idea what it will cost to buy a used air
pump and all the plumbing for a 76 B and where I could find one?  I've
accepted the fact that I'm going to have to put an air pump on it to pass
Colorado emissions, but now any place I ask I'm getting prices of about
$400 including core charge.  

John Miller
Denver, CO
76 MGB
95 Nissan Pathfinder
97 Nissan Altima