Throw materia - what's the most efficient: Throw or Coin?

Is there a weapon that you can buy that is cost effective enough to stock up on to chuck at monsters instead of using Coin?

I always found that materia pretty useless, IMHO
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RPGs beaten: FF123456789XX2,FFT,CT,CC,XG,KH,Betrayal at Krondor, MM6&7,
UltimaUnderw.1&2,SeikenDensetsu2&3, Baldur1,SuperMarioRPG