We recently bought a Bosch induction hob approx. £800. It arrived with the glass smashed, the supplier replaced the hob but surprisingly did not want the other one back. Out of curiosity I looked up the cost of getting a replacement glass from Bosch and the cost was £195 and it simply required 12 screws to fix it in place.

As far as I know there is one supplier that produces the majority of glass tops for manufacturers and I cannot imagine there will be a great variation how these things are attached so if you can get hold of one replacement should be quite straight forward.

Richard