From NJ I know there are a lot. SJAP (South Jersey Agricultural Products), Banfe (in Barrington NJ), Mimlich (Mount Laurel area). There are also a lot from PA including Frey Bros mulch, Kuhn's mulch. Also, check w/ your current supplier... you may see their supplier dropping off a load and just copy down the info from their truck.
If you fail to plan ..... you plan to fail.