Look in the for sale section, pick something up that's been used but still works. Any of the well known makes will be fine, Futaba, HiTec, Savox etc.
I'd look for between 10 and 20kg of torque though. Speedo won't be vital if you were thinking of getting one for under £40. If you search the Servo shop database that has just about everything's spec's or just look through one of the shops websites at the specs.
It might be worth putting a wanted ad up ?
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