Have you contacted your local reps?  Being in the USA, never been charged shipping for samples, especially when they come thru the reps.  But, are you *sure* all your getting is chips, or maybe demo boards?  I know National has a program where you can get a demo board designed quick, and depending on the situation, can get them free..but will sometimes charge for them.
   
  I'd be whining to the rep for those kinds of charges.

       
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