The landscaping debris usually comprises a variety of stuff, including grass clippings, fallen leaves, and branch trimmings that you can use.
Did you know you can use your compost as mulch? Many gardeners swear by the benefits of composting mulch.
If you live near a stable area, you can request the stable owner for stable sweepings, which can be your free mulch.
AboutTrees.com runs a free mulch program. The service also works via an app with residents and tree services on board.
You may be surprised to hear that you can find wood chips, sawdust, grass or straw, and other mulch options on Craigslist for free.