I would never buy a ukulele that I planned to get rid of before I even bought it.
I have never bought a ukulele with plans to get rid of it. I buy (mostly) for keeps.
That being said, I got a Republic concert uke (new) a few years back, knowing it was being discontinued. Concert-size, with a hard shell case. I sent it up to Tudorp in Michigan, and he gave it a 1st-class setup, with a bone nut and bridge, leveled the frets, made it as nice as possible with what turned out to be a super-thick sound board.
I rarely play it - it sounds fine, but kinda quiet. laminated zebrawood body, a pretty little uke. But, as I don't play it, I was going to sell it, cheap.
My wife said "No." When I get around to a solid-body zebrawood uke that meets her approval, THEN I can sell the Republic uke, and not until.
As for Custom Ukes, I have one. Made for me by Bradford Donaldson. It is mine, period. Although everyone who has every played it loves the instrument (including Sarah Maisel and Stu Fuchs), I will not give this one up, even if I get to the point I can no longer play.
I do have a few 2nd/3rd hand ukes bought, sight unseen. All came from people I trust, here on UU.And I am happy with them. I have no plans to sell any of my ukes, as long as I'm alive.
-Kurt