One of my latest custom orders was for another antique upholstered rocking chair for a mommy-to-be, and it needed some seat springs replaced. (You can view my 3-step tutorial on how to reupholster a rocking chair here.)
I asked on Freecycle if anyone had any seat springs from an antique chair. I waited a day, but I had to get to started on the rocker, so went ahead and purchased new. Having new springs was good, but I had to try to make them work with the framing that the chair currently had or else I would have to rebuild the whole bottom.
Wouldn’t you know that the next day (after I just spent a chunk of change on supplies to replace the springs), a nice lady replied to my request that she had a broken rocker that I could use for parts. grrrr.