You can find paper for mulching at your local public library.
We apply permaculture gardening techniques to our lawn, which means we need a lot of sheet mulch. Finding enough newsprint (especially in this era of electronic media) isn’t easy, however.
Fortunately, we found a solution at our local public library. We’ve started carting away the library’s old newspapers each week so the staff doesn’t have to. This not only saves our librarians some work, but it also provides us with a steady, year-round supply of free sheet mulch. Our only “costs” are weekly library stops — which we would’ve made anyway — and homemade cheese ball trays that we give the library staff each Christmas. (It’s not really a bribe; it’s an investment.)