Even a basic model (single wavelength) Visible spectrometer will probably run you a few thousand dollars if you buy it new. UV capability will add a lot of cost because you need an additional light source. You may be able to find an old, used model on the cheap but 200$ or less may be a stiff ask.
Keep in mind that the analysis isn't as simple as it sounds and you won't be able to ditch the reagents completely. If you want a concentration, you'll have to maintain a series of concentration standards. You'll also need to do some method development to ensure there are no interferences.
If you have no background in chemistry, this may be a challenging analysis to get going.