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One of the best things about BEAM robotics is that you can get started without buying any bits at all-- you can just go rooting around for "techno-trash". These are some good sources of salvage

A fair number of BEAMbots use a surplus Macintosh computer floppy eject motor (in particular, the eject motor from Sony-manufactured Mac floppy drives) as a gear motor.

Before discarding a damaged or obsolete cell phone, pager, or force-feedback joystick (aka game controller), crack it open and recover the vibrating element! The vibrating part usually consists of a miniature motor with an offset-weighted shaft.