Just like the grain of sands by the sea, you don't have to worry if the number of microscopes in the world is to be discussed. In short, low cost microscopes, like student high power microscope, student low power microscope, tissue culture microscope, etc. is probably as innumerable as the number of human being living here in the world. Microscopes supply are always available to those who want to purchase and have one. If ever you'll broke it (which we are not wishing for, after all), you don't have to worry, there are available spareparts to replace it. There are even experts to repair it, in case you'll break it. Microscopes come in great sizes, brand, and kinds, so you relax. Just enjoy the beauty that technology has to offer.