There are websites online that are a bit like EBay where you can make a selection from a variety of suppliers and choose the right one according to their reputation score. This will probably be new to you, but they are the best in the business.
You won’t find these websites using Google, but on DuckDuckGo, you will need to install a new browser on your device. The one to use is Tor, and it will keep your online activity completely private and untraceable. This offers you protection and, of course, is essential for the people you will be buying from.