Affordable (under 20 bucks) and versatile, with a cute selection of styles for day or sleep. The only problem? The fit is off for girls like myself who are busty but have a smaller torso (even with a baby in said stomach). The small fit my 9 month bump, but not my 9 month boobs. The tanks are better for girls who need less support- perhaps up to a c or d cup.
Even cheaper than Target, with decent basic styles. However, there's little support in their basic styles. They are a great option for plus-size moms though because they have the largest selection of 1x - 3x and XL sizes of any place I went.
You can get nursing tanks online for about 8 bucks, but the current crop have no support- not even a shelf bra. Which is a problem if you need to put nursing pads somewhere. Best for small busts, I think, or busts that want to be free, so to speak.
Again, each tank is around the 20 dollar mark, but I'm not crazy about the shelf shelf style bra in most of them. I did like the one below, with it's belly-hiding style and two layer top. It's not supportive enough to go out in, but great for sleep time and I may get more.
Pea in the Pod:
My all around favorite so far. They have a nice long length that will go with leggings, have a lot of support so they function as a bra on their own (with most of the others, you have to wear a bra underneath) and they are padded, so additional pads won't show through. They also give a flattering shape. The small fit me and my larger size chest well. The downside? Each tank is $40, an expensive investment. I got 3, but I'll keep on my mission until I can find something flattering, fitting, and inexepensive!