Eschew Materials( Faiths & Pantheons, p. 214)
You can cast spells without material components.
Any other metamagic feat,
A spell cast with Eschew Materials can be cast with no material components. Spells without material components are not affected. Spells with material components with a gp cost of more than 1 gp are not affected. An eschewed spell uses up a spell slot of the spell's normal level.