Any gift ideas for a 11yr old who loves chemistry?

Hi! I'm a dad of an 11 yr old. He loves chemistry - says it's his favorite science subject (even though he doesn't have a specific class for it in his school). He is very self-motivated about it and picks up and reads any book that he can find - anything he can reasonably comprehend. He has imagined building a shelf full of chemistry equipment and supplies that he can use to create interesting salts, solutions, etc.

I would like to get / build him something that he can learn from and use - and stay safe.

I have explored some science kits available on Amazon, but 90% of them seem to repeat the same experiments and we've done them all.

So looking to you all here for suggestions on what to consider!

p.s.: We are in the US (just in case it matters for what's available here)