UGHHHH... cannot resist anymore. It's "tempered" not "tampered". The latter would suggest someone fiddle with the glass to make it faulty, and you wouldn't want to use that.
Sorry, Kelvin, no specific sources, but any glass shop or tank-maker should be able to get for you. It'll be expensive, my contractor told me >$1k to temper a glass door. Prices may not be proportional as a glass big enough to be a door is probably a lot harder to handle and temper then a 72" x 7" strip.
I don't think you can find pre-shaped pieces. You can't cut/drill/sand tempered glass; it all has to be done before. So they won't usually have tempered glass sitting around unless it was wrongly shaped and was rejected, and whats the chance that it's even close to what you need. You'll need to custom order from a glass shop.
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