I’ve found nutricost to be good (they do well in Suppco’s analyses apparently), and they have a great variety of supplements, but very few “blend” type products - I.e. they’re a good place to get what you want for a good deal and nothing more.
I use Creapure (a/k/a "German Creatine")as well. Always hard to know with supplements but Creapure seems to be legit. Also use creatine monohydrate not creatine HCL. Monohydrate is harder to disolve so use warm water (I put mine in my coffee) but it's the one that's been studied the most and has the most documented evidence.
but you are right, independent testing finds some brands are garbage
* https://supp.co/tested/creatine.pdf
* https://supp.co/articles/suppco-tested-creatine-testing-resu...
I switched to sportsresearch brand when they had a sale on amazon
$19 for 1KG (2.2 pounds) but it's like double that now (don't buy) amazon.com/dp/B0DXR7MPNV