I have been doing it for many years, and have made some helluva deals at the yard/garage sales. The trick is to look in the newspaper and on your local Craigslist, and check out only the sales with tools listed. You will hit many small potato tools this way, but every once in a while you get lucky. I have purchased not just tools, but equipment for my shop. I have a couple hundred dollars invested in equipment from yard sales that the new price on is in the $23,000 range. One piece alone that I paid $40 for sells for $16,000 new. Another $20 purchase sells for $4,800. Never have expectations at a garage sale, and you will never be disappointed.