This is my new weapon of choice - the Pentel GFKP brush pen. I got it in the mail last week and it's amazing. It's a great tool for an artist on the run. It's a bit pricey, but for a brush fanatic like myself, it's well worth the money. The only minus is that it doesn't have a refillable inkwell. It requires separate cartridges which run just over a buck apiece. But, oh, does it make a sweet line. For any and all interested, I got mine here. They don't seem to be readily available in the States, so chances are you won't find one at your local art shop. If you wanna kick your ink bottle habit, pick one up.