Depends on what you want...
x30 triplet loupe does a decent job of quick inspections at high mag... can see the super small bugs & trich's at this range. Anything higher gets to be a little problematic in focusing & holding still.
The above, or anything under 50, is cheap... the optics aren't that great, though work. Usually this means images aren't as crisp across the field of vision. For example, I have a x25 pocket microscope that enlarges greater than the x30 power loupe & images a much wider view, in focus.
Check out Peak Optics if you want the high-end gear. Model 2050-25x, scaled, erect image.... that's the one I was referring to above. BTW, when into actual "microscopes" be cautious of erect vs inverted images... erect gives you what you would see w the naked eye vs inverted w "normal" scopes. Peace.