Where do I get legit LCD and touchscreen panel?

Hi everybody, I've a DS Lite which started having a malfunction in the touchscreen, it was "fixed" but poorly, my screen was completely original but the guy replaced the LCD even when I asked him to don't do that (cause my screens wasn't yellowed) so now my bottom screen is yellowed and upper is not, indeed he claimed he did not changed it but AFAIK the screens does not changes it's color...

I've been searching for legit bottom screens and it's touch panel (cause the touchscreen that was replaced is scratched) but I'm not completely sure where to buy them, and that's why I've had bad experiences with eBay (bought a Ds Lite which had both screens like a ghost effect, I hate that, BTW my current bottom screen has this ghost effect which I totally dislike), around here they just have replicas.

If anyone can link me some reliable screens I'll be so happy, I was trying luck in Amazon Mexico (my country) and seems that BisLinks sells some that he claimed to be OEM, but unfortunately seems for me that the screen does not match with ones that I've around there (they're broken, but they came with the DS when purchased, so I'm almost sure that they are no replicas or something).

Basically what I want is:

- Functional and not scratched touchscreen.

- Not yellowed or reddish or something weird bottom screen.

- No ghost effect, just a perfect image like the upper one, and my previous one, which to be honest, I don't know if I can get it back, the guy probably broke it or lost it so that's why he lied to me and gave me a defective bottom screen (I don't trust they change the color itself), he didn't asked me a penny, but even in that scenario I want to get a proper enjoyable experience with the DS Lite that I've purchased specifically to finish my backlog of years ago.

As I've said before I'm from Mexico so shipping would be a problem,I'm out of Craigslist or something like that, and buying used ones is discard too cause most of the used handhelds I've seen had a scratched screen and I want to replace that too, also while in Internet the return policies helps a ton in my case is discard again cause the shipping back always cost me more than the item (like 80 or 90 USD using the cheapest and slower mail service).

Thanks so much in advance!