@AeroPep we don't recommend shops, but here's how to narrow it down.
on peptigrity.com/shops set "Ships from" to United States and "Sells" to Bulk. open each shop's page and look at its lab tests. how recent they are, which labs, and whether you can look the report up on the lab's own site.
ask straight where it's made. a lot of US bulk stock is made in China and ships from a US warehouse. that's fine if you only need US shipping. just know which one you're buying.
before you commit to 150 kits, buy one kit as a normal customer and get a vial tested. a sample they send knowing you'll test it proves less. test identity and mg, not only purity. when the bulk order lands, test vials from that lot too. a good sample doesn't mean a good lot. the testing planner shows which tests to order, what they cost and which labs run them: peptigrity.com/tools/testing-planner
if you're reselling, pick a lab with a public lookup so your buyers can check the report. post your results at peptigrity.com/submit-test so the next buyer sees them.
anyone who has bought bulk from a US shop, post which one and how the lot tested.
shops: if you do bulk, say so on your shop board. buyer threads aren't for pitches.