Go Pro lens replacement?

Thought i'd ask on here if anyone has had to have the glass on their Go Pro replaced before?
I have a visable scratch (when in the sun) on my lens and though someone on here might have replaced this themselves or sent it to a shop with out costing an arm or a leg.

Is there anywhere in Aus that does it at a reasonable price?
Has anyone purchased new glass and done it as a home job?

Thanks.

Youtube it, it's not that hard to do unless you're not really good with your hands.