I came across this picture last night.
A favorite topic of conversation among eBay buyers looking for inspiration is about the item(s) that brought the most money.
When we were first starting out, I bought a motorcycle helmet for a quarter at a garage sale. It sold for $125. That is in the top of our high profit sales. Some years ago, we also purchased some furniture from Goodwill for $50, used it heavily for a year, and sold it for $1500 or more (we can't remember and would need to look up records)
So what's up with the beat up binoculars? We bought these for $100 and sold them less than 48 hours later for $2000 AS-IS. These are WWII U-Boat Commander's binoculars with Carl Zeiss optics. While most of these binoculars ended up at the bottom of the ocean (and these appear to have come from there) and you may not find a pair yourself, two things to note: (1) there ARE great treasures to be found sometimes, and (2) just about anything with Carl Zeiss lenses is good money (cameras, etc.).
Our most recent sale over $1000 was a mobility device for a disabled adult (paid $250 sold within two days for $1400 cash on Craigslist).
Happy hunting! Feel free to share your most impressive finds.