Where to buy good original quality parts?

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hey


I found my Topaz anywhere in my flat (have a EVO 3D now) and I want to repair it....

all my exterieur parts (outside) is broken, this means:

color of the case is about to be rubbed out (sorry for my english) and is about to change the color from light gold/silver to black also the battery cover is broken and my battery is ****, it holds 3-4 hours now and charges only 30minutes

so I really need to change the parts and I"ve heard that many copied parts, not original are on ebay....the thing is, that I have not much money to buy all thing at htc store so I really need cheap but quality parts.. ahh , also my digitizer is in a not really good condition, need to really hard press on it to get any response from the phone..

anyone got idea?

would apreciate it if i get a quick and good answer