Sounds like they would maybe groove the top of the glass all around so that the mesh lid could fit in it and be hidden. That would make sense as to the cost. Otherwise, I would just buy a cheap kit from BRS for $50 or whatever it costs... Using the clear mesh doesn't affect your lighting much at all. I have not noticed any changes in my tank since I added a screen. If you are going to be getting anthias and wrasses, etc. then I would definitely recommend a screen.
I highly suggest staying away from glass lids. First off, your lighting will suffer. Secondly, you need oxygen in your tank and without an exposed surface, that can be a real problem. Finally, evaporation is a good thing for your tank. Promoting evaporation allows you to introduce oxygenated, fresh, clean top off water for your tank.
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