My Motorola Triumph is cracked- good repair service?

[BenChaplin]

My Triumph is for Virgin Mobile so they cant repair so I am looking for outside companies. The outside surface is fine but there is a crack undernearth it which makes the screen black in the top left part of the screen. The front and back plates have also begun to come apart and dust has seeped in under the screen. Anyone know of a good repair service and estimate odlf how much it will cost to fix?