A couple of months ago, a couple of my Antminers went down due to losing connection while updating the firmware. So I'm planning to get new ones, but I can't seem to find which one to get, and from which reseller.
Look into serial to usb saves assuming it was S3's. You might be able to save those miners for 10 dollar or less adapter in most cases.
As far as new gear buy direct. If you are looking for used gear most likely look on ebay or the forum.