We are going to add a shelf under a coffee table that must be able to hold the weight of 2 x Skyboxes. Not sure how thick the glass or perspex would need to be, but which would cost less do you think, ready cut?
glass would be preferable, but you would need to find the size you need. Perspex will scratch easily, and quickly goes dull even if rubbed with a dry duster or a damp sponge.
You can't cut ordinary safety glass, it has to be made and treated in the factory. However you can cut laminated glass. You will need to find a local merchant to do it, and specify that the edges must be polished (otherwise they will cut you) unless you are going to put it in a frame where all edges will be enclosed. Not all glass merchants offer that. I don't know what it would cost. You could also enquire about having tempered glass made in your size.