The best and cheapest method we have found is to hire a couple of neighbor kids to pick them up.
We 'had' 3 very large and old Golden Willows. They were mainly dead and were not worth saving. They were the worst for dropping branches. We also had to remove 4 fir trees, one was huge, in the front yard. All were diseased. I was upset about that but they couldn't be saved. Soo, we bought a place, in the winter, with these 'beautiful' trees and by mid-summer only have one nice sized fir tree left.
We are also left with 3 willow stumps that are 4' to 5' around!