Let's see here... Uh, in downtown IC, there's Prairie Lights (upstairs by Sci-Fi) and Daydreams (also carries Pocky and Ramune, I'm told), both on the same street whose name I don't know.

At the Sycamore mall there's Waldenbooks; they've got a good three wall-shelved devoted to it at the moment. And then there's Barnes and Noble in the Coral Ridge Mall.

I think that's about it, though you can sometimes also pick up manga second-hand at Northside Book Market and The Haunted Bookshop.

And if all else fails, the Public Library's selection of manga is growing spectacularly.