I dont have any recomendations but as a toy you can get decent ones for that kind of money. What I will say is for a 6 year old make sure you buy something you can get spares for otherwise one good crash will end the fun forever.
I survived covid so I'm a pro pineapple beer brewer and famiar with bottle bombs. Its just on semi tight and I burp it a few times a day.
When things started out it had some liquid at the top but its floating up so I assume this is where the weight is needed? Not sure I have anything I'd feel...
Showed up in my new post thread but I run a CSS filter and Ive notices the new posts thread now has promotion so I have like 2 posts on the first page most of the time. I'd guess regular user posts are getting pushed well down the list.