broken screen:P800

hey ppl
i just broke my touch screen on my P800, cracked right down the middle.
i'm really pissed off but i want to replace it wat are my chances? take it back to optus or some shop and send it back to them or buy a screen and do it myself?
thanks for ur help

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oh yeh by the way the screen shows up alright just the touch screen part doesn't work. everything still looks great, just doesn't work great...