Basically Modafanil is really hard to get in the USA without a legitimate prescription because the DEA/customs are really good about finding scheduled drugs in the mail. In the USA you will probably need to do a service where you pay an online pharmacist/doctor to do a consultation and prescribe you the medication.

Europe is easier.

this one might work, good luck and godspeed

   I'm going to restore the statement regarding
   the effectiveness of generics. Yes, in theory,
   the basic ingredient is the same. However, (1) no
   one really knows if Modalert is pure modafinil,
   (2) according to Cephalon's research, modafinil
   loses efficiency if it's in the form of particles
   larger than 40 microns (see US patent 5618845).
   It's not known if particles in Modalert are
   small enough. --Itinerant1 22:47, 4 May 2007 (UTC)

and

    Modalert claims to be a generic Modafinil but almost
    all accounts describe it as inferior and its effect
    sounds like it could have something like caffiene
    and/or ingredients used in over-the-counter diet
    medicines to simulate an energizing effect.

    I recently reacquired my interest in Modafinil
    because I'm a first year graduate student and I
    need to concentrate for long periods of time.
    But, I chose to be a retard and got sucked into
    buying the cheap Sun Pharma internet crap from
    India that is UTTERLY WORTHLESS!!! I received my
    package today with glee anticipating all those great
    mental and emotional stimulating effects I received
    from Provigil 5 years ago - but listen people, the 
    stuff is ENTIRELY INEFFECTIVE, [...] All I've
    experienced today is an unpleasant and extremely
    jittery ephedra like feeling - no fun at all, and it's
    NOTHING like the true effects of REAL Modafinil. [...]

Here is a thread where someone thinks that the different effectiveness of Modalert is the result of a different formulation: http://www.drugbuyers.com/freeboard/ubbthreads.php/ubb/showt...