I'd check with B&H first, to see if they have a new one, then KEH for a used Minolta TTL cord. I would suspect these things are rather rare, as I cannot recall ever seeing one in the store during the four and a half years I worked at Coopers Camera Mart. Most of our X-700 sales were to high school and college students getting something to use in their photo 101 class. And the Maxxum cameras used a completely different proprietary flash shoe, so they were not backwards compatible. Your best bet might be to look for a Promaster flash unit with detachable module for your specific camera - they made some of their higher-end flashes with bounce and swivel that could snap on and off different feet with the appropriate matching ttl hot shoe, and some of them had an accessory off-camera sync cord that would go between the module and the flash head.