http://biblemeowimkh3utujmhm6oh2oeb3ubjw2lpgeq3lahrfr2l6ev6zgyd.onion/content/bible/darknetmarkets/choosing_a_vendor/index.html
Can the vendor answer questions to the products he is offering, how he is shipping, . . .? Are the photos that the vendor uses meaningful? Do they show the actual product with his name tag or are they just stock photos? If they contain potential OpSec compromising details, like a hand that hold the product or other things in the background, avoid that vendor.