Fountain Pen Shops

Fahrney's Pens in Washington, D.C.
Fountain Pen Hospital Pens & Supplies in New York City
Pendemonium of Fort Madison, Iowa. An interesting assortment of new and old pen things.
Nibs.com - they fix them and they sell them.

Fountain Pen Repairs

Nibs.com - I've heard they're very good.
"The Southern Scribe"Repair services and selling new and vintage pens
Pentiques - Out of Ohio, they also sell tools
and, of course, pen stores in Texas...
Jeffrey Stone, Ltd. - Houston, Texas. Very cool store.
Dromgooles - Houston, Texas. Great ink selection. Cartridges in the hard-to-find colors.

Fountain pen parts and repair tools

The Pen Sac company - makers of replacement ink sacs.

Assorted fountain pen pages