Best place to buy cheap ink (the dark stuff)

I've been using TWSBI Diamond 580 for a while. I am looking to start using FP again more often. I like to be able to buy some cheap ink. I'm not looking for anything specific. Can someone tell me the best place to get the stuff cheap? I'm not a fan of the really expensive bottles, I'm not a fan of the 3oz bottles. I just want something that's like $3-5 per 60ml.<br><br>I was thinking Goulet Pens, but their ink is 30ml for $14. That's like $5 per 10ml or 25 cents per ml. That's pretty steep. I can get some decent tap beer around here for like 25 cents per ml. I already like the taste of beer, so I don't have to worry about trying to like the taste of beer.<br><br>But I don't really like the taste of ink.<br><br>I can get 60ml of TWSBI Diamond ink for $15 each (2 per box), so 60ml for $7.50 or 12 cents per ml.<br><br>I'm 99% sure there's cheaper out there, but I'm hoping there's somewhere I can buy a 60ml bottle for maybe $3.