Here are a couple things I've done
I'm not a professional or anything but there is definitely a noticeable quality difference. I bought mine from amazon and they are legitimate. You have to make sure whatever the seller is that they are highly rated and have a lot of sales.
Here is the amazon link to the ones I bought
https://www.amazon.com/gp/aw/d/B000MRWH5M?psc=1&ref=ppx_pop_mob_b_asin_title