If you really need the drug, here is
modafinil buying guide. Looks like all the needed info is in there. I myself don't really understand all the hype around it. I had to use it for a while and it's just a drug that can help you to solve a list of health-related problems. If you don't have any, why on earth would you use the thing? And if you do, getting a prescription won't be a problem. Well, it can boost your cognitive abilities of course but do you really always experience situations when you need to boost your brain and it's impossible to handle the task without it?