A lot of the really important spells in the game (Such as Greater Malison, Breach, Lower Resistance, Pierce Magic) aren't found in stores, they're out scattered among the various quests. This is probably to make the excitement of finding a cool new spell more spread out through the whole game, not all at once in the beginning.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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