Long before programmers started coding applications like eBay or Craigslist, garage sales were the only tool of choice for the bargain hunters. If you have never been to a garage sale it might be due to some of the myths.
Have you ever purchased an used car? If you can buy a used car why can’t you buy other used things? I often go to garage sells to pickup treasures. Somebody’s junk can be others’ treasure.
I once tried setting up a side business of buying from garage sales and selling on eBay. I made decent money leveraging the price difference. I got my first video camera with the money I accumulated with week-end ventures. Pretty soon I did realize that the model is only sustainable if I did it full-time.