PT-Boat is the shapeways 3D printed model section of the long running www.pt-boat.com website, that I set up around 1998, which specialises in developing and designing serious performance, highly detailed and accurate, scale model, operational WW2 torpedo boats and accessories and making most of that design work and crazy ideas available for fellow modellers. If I have what you need but not your particular scale, let me know, I will create it at no cost if I have time available. I make a very modest markup on each part but some pieces are still expensive as the Shapeways cost is a combination of material, volume, weight, machine space and markup and sometimes doesn't seem very rational! Some parts are not printable in particular materials so I have to substitute sometimes for something similar. If you want a part in a particular material, let me know!
Shapeways have added two new materials to every Item in everyones shop, a Clear Ultrafine Detail Plastic, great for clear lenses and a Gray Fine Detail Plastic which I have made a few things out of and I am not happy with it's durability, it seems to warp quite a bit in a thin sheet area, I will now have to go through and edit it out of each product as many things will not work well in it!