Here is a nice, underrated and often unnoticed ink that I just purchased on sale from Goulet Pens on sale (no affiliation). If you notice in the scan, there isn't a lot of blue to the ink, it's more of a gray/black with a hint of blue, but I love it. Has a great vintage feel to it, and doesn't seem to fade to teal like Quink Blue-Black does. I really enjoy the stuff, but if you're looking for something with a lot of blue in it, this probably isn't for you.
Update 9-16-14: This is still one of my favorite inks to use and I still highly recommend it. Amazon also carries it, and if interested it can be purchased for under $10 as of my time of writing this. As much as I use it, I'm still on my first bottle! Amazon: Sheaffer Skrip Blue-Black
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