OK, I need more space on my Tivo HD. Plug and play sounds like the easiest option. As far as I can tell, Tivo still only officially supports the WD My DVR expansion drives. Fine. I'll take one. Except no one sells it. It's either discontinued or there's massive demand because every retail site says it's out of stock and they'll email me when (if) it becomes available. It's even out of stock directly from Western Digital. I can get it from Tivo.com for $199, but I was hoping for a little price competition. Can someone point me to a site that actually has them available for less? Thanks.