I'm not looking for sources here, nor information regarding a certain drug or who sells the best of it but I would like to know if it is at all possible to do any of this in an easier way than skimming through the markets and cross checking them? Or, is that the common practice?
Thanks for your time.
that is the go to way. there are some ways you can speed it up [e.g. sorting by price from low to high] but once you found a reliable vendor you usually stick to that guy.