All of my pen models can be made into a bulb filler, with the exception of the Herald.

Whether or not the barrel is made from a translucent material, making a pen into a bulb filler adds $100 to the typical cost of a cartridge/converter pen.  This means typically $350 with a steel nib, and $425 with a gold nib.  Email me if you are interested in an exact quote.

Below is a quick video showing how a bulb filler fills....

And here is a slideshow showing bulb fillers that I've made.  If you see a pen that you like, click on it to see a description.  Or click here to see the entire set of bulb fillers on FlickR.