There are lots of those cables on ebay for as little as $40.00. However, it looks like the cable alone is not all you need. There's also another little box that goes with the cable that converts the caliper data to keystrokes. I assume you can avoid that if you can figure out the raw data format. There is a complete setup with cable and box on ebay for $70.00 (Not made by Mitutoyo, though).