Composted cattle manure is excellent. Check the Farmers and Consumers Market Bulletin for the closest location to you. It's often available for a nominal fee, but you must go pick it up.
Make sure you ask that it is composted.

GGG

There is a landfill off Lawrenceville Hwy (US-29) just east of the intersection with Jimmy Carter Blvd. If you have a truck, they'll fill it for "A small loading fee" ($5) with wood mulch. About 75% pine, 25% hardwood (both bark and chips). There's a bit of foreign matter since this is residential chopped trees. I've found bits of wire from extension cords, pieces of black landscape fabric and pots, pieces of cloth, and the remnants of a foam kneeling pad. The rate for trash is about 1 pint per cubic yard, in my experience.

It isn't "twice ground" like the stuff you can get delivered, so there are some fist-sized pieces of wood, but the price is right for me.

Oh, get there by 4:30. They close down at 5:00, which means the front end loader is headed back to the office at 4:40.

I recently had the Georgia Power Company deliver some mulch to me for free. They have a tree crew that cuts branches to keep them off the lines, and they will gladly dump a load in your yard or driveway if you call them. Sorry, I don't have the number anymore, but if you call GA Power they should be able to give it to you.
The mulch is like the above post, it contains some "foreign matter" (I found an unbroken beer bottle in mine). It's a mix of leaf, branch, and whole tree mulch.

You can pick up mulch for free from Dekalb County. I'm pretty sure you can get it in the governmental complex near where the Dekalb County Jail is. Off Memorial Drive. Also, the Dekalb County landfill in south Dekalb County used to have it as well. I'm sure if you call the main Dekalb County # in the phone book they can give you detail directions or get you to someone who can.

I also buy from Luxury Landscape they are the best around and have awesome product quality and prices - you may want to check out their soil/compost mix or humus mix. I've used their products for years in my annual beds and veggie garden - can't believe the yield.