If you look around Thingiverse, you'll find that most of the popular and non-decorative stuff is designed in OpenSCAD.
To the original question, MakerGear makes some high quality kits.
Re:3D Printing: The Game Changer
by simcop2387 on Saturday June 09, 2012 @06:28PM
(#4089519)
Actually most of what I've seen is from sketchup (free), OpenSCAD (Free), or Autodesk 123D (free). There's some solidworks stuff but I have no idea if it's pirated or not, nobody does from the perspective of the person getting the files to print.
I think the worst cost issue is the money for the crappy plastic.
Also everyone is using pirated copies of 3d software instead of freecad