I live across the border in Cecil co. MD, and I ended up getting it delivered (50lb bag from somewhere in GA.--$60. or so) BUT it is well worth it! I am new to chickens, and was extremly discouraged with the flys this spring! I got chicknes to EAT insects and was excited to see the peeps chasing every nat and fly they saw--right in the air! But now they are four months old and they are more interested in things on the ground. anyway, I deep liter and as soon as I sprinkled DE over the litter the flys took off and most left! I would love to sprinkle a new layer every morning--but I am afraid this would be too much....
I also am an organic gardener--I have gotten my monies worth out of it in the garden too. It is the only organic answer that I have found to do away with cabbage worms on my broccoli--and keep the slugs at bay. I just sprinkle some on the plants once a week or so. If one should eat some it is actualy good for you, i ahve seen posts that people claim to eat it strait! (or mixed with water) I just started to use it on squash plants too--will see how it works on squash bugs.
I think the 50lb bag will last a few years......I have 40 head in two coops.
if you do find it locally, please let me know though...