https://www.amazon.com/Melatonin-3mg-Theanine-200mg-Supplement/dp/B07T99BDDG/

https://www.amazon.com/Natures-Bounty-millgrams-milligrams-L-Theanine/dp/B01HDPH81I/

I'm not sure if your Nature Made product is coming back. You should try the Nature Trove and if it works then maybe stock up. Or else get used to taking two pills.

...

Oh wait, Walgreen's also makes one:

https://www.walgreens.com/store/c/walgreens-melatonin---l-theanine-capsules/ID=300426791-product