I think craigslist is pretty close. That said it takes time and effort, and a little bit of opening up to the general public.

I remember doing a garage sale before moving years ago. We sold some stuff, but in reality nobody wants to give you anything for your stuff. I still remember a guy who came, pushing his way over asking brusquely, "Do you have any jewelry, watches, iphones or ipads?". When I said no, he left just as abruptly as he came.

Now goodwill is our preferred way. We found it is hard to get any sort of tax credit to work, so we don't even bother with receipts anymore.