Our library sells outdated magazines for 25 cents each. Plus I have generous friends who know I like to collage, so I often get donations from them. Another source for cheap magazines or old books are the thrift stores, like Goodwill or Salvation Army.
On occasion, I will splurge and buy antique ephemera at an antique mall. And once a year St. Louis has a vintage postcard show. But I digress, I was talking about FREE fodder.
Besides the library, you don't have to go any further than your mailbox. There are some great and unexpected treasures in there. I love the patterns found in security envelopes. Advertisements and catalogs have interesting images and plenty of words.
I used junk mail and a quote from a friend for yesterday's collage.
Other fun sources for fodder includes the paint department at a hardware store. I found fun swatches and a stencil. (See the ad card below.) It's made out of plasticized material, so it will even be reusable.)