If you GET the flu (any REAL flu) - you can get the Tamiflu or Relenza, but if you want to use them as a preventative, which they suggest can be useful, (medical and quarantine officers took them as preventatives at bird flu scare time) then you'll have to buy them.
Useful if you're travelling on planes, but just keep the vitamins up imo! You're young and healthy!! (Oh all right then, you'd better get some old fella!! hehehe)
No one's revisited that we only recently had equine flu here too......... better tighten up quarantine!!