Troops and Tracks is an on-line shop which has a seemingly large range of crew sets. Some are print to order some cast. I recently bit the bullet and bought the Milicast US Bofors crew; honestly, they're lovely castings.
You could try contacting vehicle manufactures, SHQ/SandS or plough through Shapeways/other print services.
Bottom line, IMHO you're going to fork out at least €12 for 5/6 crewmen of quality.
Sorry
John