I have a couple of questions about buying the lens: I've never used e-Bay, but do find a number of examples of the lens available there. Is the general experience with e-Bay good? Also, there are some examples from Japanese sellers with "mint'" and "excellent++" ratings for the lenses. Any experience with buying from sellers in Japan? (There was one described as "mint" for $71)
I've bought around a dozen used lenses off eBay, and I've had mostly good experiences.
There is a learning curve on eBay, so you should learn to read the entire listing, pay attention to certain terms, and shop long enough to give you some background for each model item you are considering.
I will say that on average, equipment from Japan is the cleanest of the group. I won't buy a camera body from Japan, due to Nikon's reluctance to service non-U.S. cameras. I usually don't bid on auction items, preferring instead to "buy now", so I know the bottom line. Yes, I can and have bid on auction items, but I'd just rather not.
Bear in mind that shipping from Japan is not cheap, so be sure to add in the cost of shipping. The merchandise takes only a few days longer than something in the U.S. Sometimes the shipping is included, and those offerings will get my attention right away.
With any item offering, be sure to scroll down the page to read the details, and watch for "red flags" in the text. If I'm shopping for a lens, and I am wanting a very clean example, I will shy away from anything that looks as if it may have been abused. (frankly, items from the U.S.) Also; things like fungus could degrade the contrast of a lens, so it will depend on what I'm looking for whether I will consider it.
(anecdote) I once bought a lens with (quite small) balsam separation, and it was shown in the photos, but when it arrived, I could not see the separation. I don't know how he got such an excellent photograph to show something I cannot see in person.
The one time I got a poor deal, I bought a lens (U.S.) that broke about a year later. Not a huge deal, and it still works, so I gave it to my son and bought another of the same model.