Oh my lord. The most expensive case I could find (when you throw a Thermaltake PSU in with the deal) was right about that but it has a 10" display built in to it.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119127This is the one that is listed at 999.99. It is now sold out... amazingly enough.
Edit: Well hell never mind... that is from all the way back in 2007. LOL. I just did a search for $1000 pc case and that was the only one I found that had multiple listings.
Edit 2:
http://www.myshopping.com.au/PT--67_Computer_Cases__fs_p5_e__ This place has a list of $1000+ pc cases, Australian dollars. I don't remember the thermaltake level 10 being that expensive, but I could be remembering wrong.