Like Dixana said COMPOSTED Manure. Please do not add anything you think may be fresh or not completely broken down. It will only serve to frustrate your gardening plans as manure not totally composted will burn your plants.
My compost consists of some manure in the form of material I take from a local horse stable with straw and wood shavings in it. I'll use it, leaves, grass clippings, garden scrap and kitchen scrap to make my compost. It takes between 3-4 months for this stuff to break down enough to place in my garden.
If you need some now, I'd suggest a nursery center or place that sells garden soil, fill dirt, mulch,etc. Some municipalities are lucky and have a composting plan in place that can be taken advantage of by residents. Unfortunately, New Orleans is not one of those progressive thinking cities.