Visible Light Spectrophotometer Recommendations
Disclaimer: I'm not affiliated with any company

However, 
Ocean Optics cuvette spectrophotometers are a good choice 

This model is used in some undergraduate labs and is good because the cuvette holder is built in (i.e. it doesn't require a fiber optic cable). 

As long as the optics don’t get jumbled, the prism detector mechanism work well and reliably for many years, although it says to get it checked each year. 

If you're on a tight budget I'd recommend looking at a DIY spectrophotometer. In particular the RasberryPI designs seem relatively simple

The Hackaday website has a blog dedicated to DIY spectrometers.