legit touch screen digitizer

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http://forums.androidcentral.com – hey guys , i ever so slightly cracked my glass on my 2013 nex7. hairline crack and touch screen in unresponsive above the crack but works fine below. i want to purchase a new one that is a true geniune replacement. im guessing its just the touch screen digitizer because the lcd seems fine. i see them on ebay from china for like 35 bucks. im guessing those arent accurate replacements? my question is...where can i buy the real thing so i can do it myself? im hearing there somewhere in the$ 100 and up range . and how will i know if its the great 1920 x1200 display if i have to buy the w (HowTos)