The problem law enforcement is going to have with doing large-scale busts over something like the silk-road is they can't send real drugs to get a decent reputation. They are going to be flagged quickly as a rip-off because they either won't send real drugs or it will be a carefully controlled bust. Either way your not getting good user feedback. They will only be able to bust the few people willing to give a new seller a try. Want to avoid cops, avoid anyone who you cant be certain has sent real drugs before. They might takeover an account after an unrelated bust but come-on buying prohibited substances is never without risk.
One thing to consider is that the person who is selling might keep the information you give them as a bargaining chip if they ever get busted. This is especially true for regular customers who want quantity. Shipping it to a third party (dead drop or friend with a clean nose) is a good thing.
With all that said there are a few "companies" operating online with little protection that offer (US) schedule 2 narcotics that have proven surprisingly resilient to law enforcement, and I have heard of no major law enforcement attempts to bust people with a fake BI (blatantly illegal) online pharmacy. Similarly I have not heard of a police operated mail-order-marijuana operation or seedbank. If law enforcement has gone that route before I am not aware of it.
What ever you do have it shipped USPS not UPS or FedEx (oh dear God don't use FedEx) and pay in bitcoin.
edit: Oh and as a fan of cyberpunk let me say that it is so wonderful to see the digital black market emerging.
