Yep, some do carry some audioVox units but at the time I bought mine I wanted a larger screen (we had previously had a 7.5" central screen in the GX and wanted something larger) so when I found the 10.2" AudioVox one on eBay (from an authorized dealer) for $375 I jumped on it. In the end, mine was less than $600 and included the 2 wireless (IR) headsets and the larger screen. The CC & BB's of hte world wanted $800+ installation for their and in may cases they were lower quality screens than audiovox. My recommendation if you do decide to buy one of the ones they offer is to look at it from the side to see if the screen is viewable "off-center". I was surprised with the JVC, Sony and even one of the older lower end audioVox's didn't give a good picture. The LAST thing I wanted was for my kids to continually say "we can't see it" if there was ambient light (during the daytime).
Here's the actual link to the "other site"
http://www.hybridchat.com/forums/showthread.php?t=953