What I've done in the past is go through the listings on empire and add all the vendors who have product you might be interested in to your 'favorite vendors' tab then go and do your homework on sites like reddit, dread, the hub, by just simply typing in the name of the vendor on the search box and dig through all the different posts until you're satisfied also on empire you could read all the feedback that's been left I usually don't bother too much with the positives because it's really all the same like "WOW AMAZING STEALTH, GOOD PRODUCT, WILL BE COMING BACK" so I go with the neutrals and negatives to see if I'm willing to trust said vendor

Hope this helps