Check out Wirecutter. It’s been my go-to site for most purchases outside my wheelhouse for years. I like how they break down their findings, like pros/cons, budget picks, and picks depending on what kind of user you are (take record players, for example: are you interested in the format, but don’t want much fuss? They’ll have suggestions for an all-in-one setup. Or are you an audiophile looking to upgrade specific parts? They’ll cover that as well). They also include advice from experts in the field of whatever they’re reviewing, which I find useful.
Wildflower seeds! Bonus if they’re native to the state/area. Packets cost a couple bucks. Add a small terra cotta pot for another couple bucks, or DIY some seed bombs and wrap them in a piece of fabric cut from a shirt/sheet/whatever you are considering discarding anyway, tying with a contrasting color of thin fabric.
For the kid in your family, I would suggest researching the wildflowers native to their area, and writing out or printing directions for them to make the seed bombs themselves. Maybe giving parents of said kid $10 to purchase soil for the project.