...that are very visible with their extraction process (710 Labs, Feeling Frosty, Lazercat, Concentrated Solutions, Royal Key). I use Puffco products for my concentrates and that seems the safe and discreet form me.

As far as the THC carts, I'm good on those except for the ones by 710 Labs as again they're very transparent about the process (the carts from them are hard to come by) so I don't really do carts that much.

Check out https://www.puffco.com/. The Plus is great for when you're out and about. And the Peak is simple to use when you are at home. Just make sure you clean it often.