there's a couple different kinds, but the one i see being used the most is this one!

https://www.amazon.com/Jurassic-World-Toys-GCV81-Blue/dp/B07FDNPGNM/

https://www.amazon.com/Jurassic-World-Tyrannosaurus-Rex-Mask/dp/B076Q6731Z/

https://www.amazon.com/Jurassic-World-Dinosaur-Opening-Tyrannosaurus/dp/B07Y9H2HN8/

I found this one that looks like its available in multiple countries: https://www.amazon.com/dp/B07FDNPGNM (you can change your country right next to the search bar)

it seems reliable, BUT, it has different sellers. here are my tips:

1. look if they have no negative reviews about items not being as described
2. the seller must sell more jurrasic world AND other stuff, so if they have only 4 items and one of them is the dino mask, its likely a scam, otherwise, its most likely legit.
3. use reviewmeta.com to check fake reviews
4. look if the description/ FAQ mentions, soft rubber, rubber, or latex, its HARD PLASTIC
5. listings under 20 dollars are too good to be true

bad reviews under the listing can be because of scammer sellers, you will most likely find a non-scammer seller if you follow these tips

edit: cleaner link