If you're a beginner, you need to buy at least a "good quality" instrument.  Buy something less, and you'll hamper your learning ability trying to use a piece of junk.  One the other hand, buying a top-notch instrument when you don't know how to play it won't make you play it any better.  You'll still sound like c^&*p!  Good stores will tell you this, and guide you to an appropriate instrument for your skill/learning level.
I bought a ukulele online from The Ukulele Site ( in Hawaii - 
https://www.theukulelesite.com/ ) a few years ago.  They were excellent in recommending me a laminate rather than solid wood uke, telling me how the dry Colorado air where I live would wreck havoc on a high end uke unless you take extra special precautions to humidify it.  And they also said, I wouldn't be able to tell or appreciate the difference between reasonably-priced and expensive while I was learning.  Good stores are like this (and I definitely recommend The Ukulele Site).