Porcupine Hollow Farm?
Has anyone used this nursery? They're in Michigan, and sell large quantities of mostly seedlings for good prices.
Their website is not the greatest - they say they do a lot of rootbag plants, some bare root, even B&B, and some traditional container, but their website isn't clear as to whether the particular size and quantity of the plant you are selecting is in a rootbag, bare-root, etc. They're also not clear if they ship nationwide but it implies that they do.
However, potentially if you need larger quantities of small stock they're a cheaper option than most places and have a bit more to choose from than, say, Musser Forests (nothing against Musser of course).