Very broad question that I just highlighted.
What type of vintage hone or hones on Ebay interest you?
I have purchased over "60" vintage hones on Ebay over the past 3 years,,,,,Carborundums, Nortons, barber hones, Welsh hones (possibly vintage?? quarries no longer operational), a coticule; all were successful/great buys. Yes, many were bought for collection purposes, not everyday use, but all were great condition. Any of them can be used today, as well as they could have been used at the time of their manufacture.
If you want a good/great everyday hone, get the Norton 4/8 as suggested.