NavTech Maps 4 autoPC

I just bought an autopc, its a supped up unit that clarion came out with in 98. Its got lots of nice options, navigation being one of them. The problem is inorder to use the navigation u need to download the maps off a data CD from navTech (got a built in HD) and these disks have been a biatch to find. I have found some on Ebay, but none for my area. Im looking for the CD thats covers the East Coast. If anyone has one or knows where to find one let me know. If I can get the navigation working Id say this is the one of the hottest units Ive come across. They've also come out with a new version called JoyRide that includes a DVD player. I recommend checking out both these units if u want something exclusive. By the way both units understand something like 200 voice commands and talk back to u. Anyways Ive gotten off topic, like I said if anyone knows where to find those data CDs hit me up.