I've never looked into the habitats for them. I did find a bunch of what I felt were good info sources just by googling "Eastern American Toad Care" and "Fowler's Toad Care". From what I've just recently Googled, I would think some clean peat moss or coco fiber (echo-earth) mixed with some pine-bark mulch plus some leaf litter is all you need. You can likely do it cheap if you just go down to a Home Depot or other big box store with a garden center. You really don't need what amounts to potting soil unless you intend to add live plants to your viv. And as I said in my previous post, even then it's not necessary. It also looks to me that you are going to need a couple decent size viv's just to keep a couple of each. Probably in the 15 plus gallon range.

Also looks like they are voracious eaters. So if you don't raise your own then you better check the prices of crickets and other insects they like.

Maybe now that you've named what you are interested in, some others with some knowledge about them will comment. I'm limited to just what I've had to learn to maintain a couple Fire-belly Toads that I was left with after my son went off to college.