Looking for replacement lcd glass for a ipod touch 4

[lavabo]

Hello

im looking for replacement part for a ipod touch 4 wich glss is broken

There is some for sale on Ebay or Hineed

but i wonder if its all same qualities!! Sure i can bring it to Apple store and have it replaced for 100$ but is it the same if i buy a kit from Ebay at 20 $ from HK ?

tx

[Psubs]

By Gorilla Glass and it won't break.

[lavabo]

By Gorilla Glass and it won't break.

where do i buy this!!
so many vendor.. wich one is gorilla??