Your outerwear is probably a little gross from last season's dirt and smells like a coat closet. (Mine does.) Dry cleaning a coat in my New York City neighborhood costs $14+ a pop. And it isn't dirt cheap where my parents live in rural North Carolina, either. Once you do the math, you could buy a new piece of outerwear for the cost of your early fall dry-cleaning bill.
You'll find that most down/puffy coats can be machine washed. Of course, always read the label first! Remove fur collars, hoods, or any other detachable pieces and, if they can be washed, place them in a mesh laundry bag before throwing them in the wash, too. After you wash your outerwear, (per the tag's instructions), dry according to those instructions, too. Don't freak out when you see your puffer reduced to a wet, crumpled shell of what it once was. It'll be just fine once it dries.
Get them from Amazon: six-pack of Woolite cloths for $8.88 and six-pack of mesh laundry bags for $7.87