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GoTo.com Inc. said it will acquire Cadabra Inc., which provides comparison-shopping services, for $250 million in cash and stock to expand its electronic commerce offerings. The Pasadena-based Internet search service will pay $8 million in cash and $242 million in stock for closely held Cadabra in the deal that’s expected to be completed as early as January. Cadabra is based in San Mateo, Calif. GoTo.com shares fell $2.13 to close at $106.13 on Nasdaq.