Montblanc Inks
Montblanc are, of course, best known for their luxury pens, but among fountain pen fans, they're just as well-liked for their inks. Montblanc ink is top quality, as you'd expect, and safe for all fountain pens. That makes it a very nice way to get a little bit of that Montblanc luxury into your life at a quite reasonable cost. The bottles are lovely designs, too, so they'll look nice on your desk.
The classic Montblanc bottle is sometimes nicknamed the 'shoe', but the unusual shape serves a very practical purpose. The raised section close to the opening means you can tip ink into that small space before uncapping the bottle, letting you fill your pen even when there's not much ink left in the bottle.