From Drug Dealer Simulator Wiki

The Cartel are key to your drug dealing journey, they are a group of main manufacturers/suppliers with the purpose of keeping prices at a high level and restricting competition from other drug dealers.

When you order Drugs from Eddie using shadyComm, he contacts the Cartel and lets them know the amount of Drugs you wish to purchase. Once purchased, Eddie will message you on your Laptop and let you know when the estimated delivery is.

Once the Drugs have been delivered you will have to go and collect them from one of many Dead Drops which are scattered around the Map.