Are Mendini or Lazzaro Saxophones worth buying?
As it relates to quality; they are identified as 'beginner to intermediate' use instruments. I have been playing professionally for many years and the Lazzaro brand is relatively new. I have ordered the Lazzaro Soprano Sax and will be better qualified to answer this question in about one week.
A low priced instrument may or may not be a good investment. If, for example, it cannot be properly tuned then you wouldn't be able to use it. Also, if the key pad & guards are noisey then the sax probably isn't a good choice for concert band. Then again, I have played on one of my students budget saxophones & it had a tone paralled to that of my pro-line saxes.