As far as I understand "あるちゃあるけど" is close in meaning to "ないとは言い切れない" and "しいていえばある" but I could not find how it is used, nor understand the exact meaning.
2 Answers
Since you haven't provided any context, let me point out that ある could be used in several different ways, like
- stating that something exists (the literal meaning)
- stating that something is reasonable/common/good (cf. それはないよ).
あるちゃあるけど is sometimes used in a longer version
あるちゃあるけど、ないちゃない
with a loose translation being
You can't say that it's not a thing, but you can't really say it's a thing either.
(where ある is translated here with the second meaning).
あるちゃあるけど by itself means essentially the same thing:
あるちゃあるけど
I guess you could say that [but why would you? / but I don't fully agree / ...]
Believe you're missing a letter:
あるっちゃあるけど
It's an extremely informal way of saying:
あると言えばあるけど
I won't deny that we have it
But the underlying connotation is that item is not available for sale/use, or it's reserved for some reason.
-- Starfox