Assuming Sony used the Mabuchi 11400 motor for the sled, this motor can be bought as part of a Philips VAM1202/12 optical pick-up. It typically retails for $21 in the USA and £19 in the UK. I bought in a module and extracted the motor to confirm.
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Topic - SCD-1 SCD-777ES sled motor type 11400 available - msg 04:54:17 04/23/07 (0)