www.freecycle.org - Stuff people were going to toss anyway gets offered to the community. People request things that they need. Only rule is it must be free.
Today I got rid of 100 sq. ft. of carpet we removed (and would have had to pay $20 to take it to the dump--$65 to have someone ELSE take it to the dump!) and picked up a huge bag full of size 5-8 boys clothes.
There could be one in your city!