Just saw this thread and decided to create my very first post in it! I've been searching through eBay and ran across these two "bundles."
http://www.ebay.com/itm/600w-Thunder-Digital-Ballast-600w-USHIO-HPS-Bulb-Lumatek-Grow-Light-Lamp-Kit-/280790149436?pt=LH_DefaultDomain_0&hash=item416065a93c...