http://www.geeks.com/details.asp?invtid=XBOX360-PB-2R&cm_mmc=geekmail-_-daily_html-_-20mar09_FREEKB-_-FREEKBmain2
It does have the restock boutton. Click it and enter your email and they will notify you when they back in stock.
Buy.com has the thing for $139.99 with free shipping. These are the old Xbox 360 Premium models that have been refurbished, which would mean it will definitely RRoD at some point and it doesn't have an HDMI port. Still, really good price and might be worth the gamble for someone. Personally, I'd just buy an a brand new Xbox 360 Arcade from Dell for $159 instead.