there is no national directory ,but if you want to purchase bulk or bag product i could send you in the right direction.The following is a list of distributors in the east.
contact the following for these states
New Jersey Aspen Environmental
New York and New England Taconic Maintenance
Sorry Iowastorm Magic is not sold in the midwest,i would like to help u out but i think the distance would make trucking prohibitivly exspensive.Not to leave you hanging though there is a product called M50 which may be out in your area and it is very similar to Magic.
Standard Tar does handle it I called them a while back but they do not seem to know about it in its liquid form or at least they do not sell it because thy did not have any in stock.They also were one of the people who really tried to steer me to something else.
I too had the same experience with Standard Tar. Will ship bagged magic to Michigan, and the liquid in 32oz containers. Is there anyone who can ship the bulk liquid to the midwest? Prices? Someone must.