If you can find a used one, GET IT.
Brand new zero's haven't existed since a tiny batch released over 14 months ago!!!
They randomly keep saying that new batches and units will be available soon, but they've been saying that sinc literally January.
So, rule of thumb... If you really want one... And you find ANYTHING NEW OR USED, get it. You may never see one again or for at least another few months to years before the next random one pops up.