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I don't know why you are asking here, there are a lot of places where you can buy a glass bed for your Wanhao: Where you bought your 3d printer, amazon, ebay, your local glazier (People who work with windows etc), you could use a piece of used mirror or window from old furniture.
If you have further questions about your 3d printer, I advice you to go somewhere else, perhaps the "Duplicator i3" facebook group, or the "Wanhao duplicator i3 owners" group here on thingiverse?