I love the Tsukineko tool, Fantastix. TheSuperStore here sells the ink here but not the tool. I buy mine at M's. They are $4.99. The tool looks like a pencil but has either a point shaped dauber or small eraser size dauber that's perfect for inking. The set comes with 3 small round daubers and 3 small pointed ones. Just perfect for inking.
Fab product. They're called Fantastix.
Tsukineko Fantastix inking tool