Actually printers normally user Stepper Motors, not Servo's. The best thing to salvage for servos is RC toy cars. You may be able to find several really cheap at a Thrift Shop.
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Yes, from most broken computer printers. Try finding one on the sidewalk during trash day or go to the local recycling center and ask if they have one to spare for a local inventor / artist (or whatever you think will get you the most sympathy).