The vintage ones were made by Azusa but are pretty tough to find.
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You can make your own with an old hand truck, Ford 8N tractor starter, a pulley with set screw, battery, momentary switch, and a long fan belt. That's a 6V starter but a regular 12V car battery works fine . If you need to reverse the starting rotation you only need to reverse polarity or put a half-twist in the belt.