Well, that's 3D printing for you. These sort of things cost $25 to $30 as low-production rate resin kits (see the Sloppy Jalopy website, for example). I see the price of a 4-wheeled armored car for WH40K is £33.00 ... $52.80.
http://www.forgeworld.co.uk/Warhamme...T_VEHICLE.html
And you don't need groups and squadrons of Project vehicles, heh.
Our 3D artist spent quite a while on research and modeling; and printed out the prototype. He's not gonna break even till he's sold at least half-a-dozen of these (I plan to buy at least one myself).
The various "bad guy" vehicles are mostly die-cast or plastic toys, bought at the flea market or dollar store, torn apart and repainted. So ... I save money there.
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Michael B.