If you are interested in Z Chains, Zoro Tools http://zorotools.com carries the Super Z and Super Z6 (not the plain Z that Tesla sells). Today (11/5) from 11 AM to 2PM CST, 30% off using code 30NOW. All day, 15% off using code 15TODAY. Free shipping >$50, sans sales tax in most states. I opted for the SZ-143, Super Z6 for $46.19.