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If you don't have or provide any insight into their testing processes, I don't think a recommendation is relevant here.

I buy from there too.

Here's their answer and it's disappointing. tl;dr: they import the whole spice and have it ground in the US.

forget trusted suppliers; they should be running lab tests on random samples

I emailed Bill Penzey a few years ago, asking if they did testing for lead in their turmeric, got no response.

seconded - high quality and friendly service. Hard to ask for more.

Unless you maybe want to ask for proof that they test their products for lead. That seems pretty easy.