look like they are for sure out of business now
i saw they had a liquidation auction of their office and warehouse
from this link back in march ( wish i would have known)
http://www.vanhornauctions.com/norco-technologies-inc.html
but i might be willing to sell off my rpc-4224 , for the right price , i havent done much with it
i bought some upgrades for it as well the slide rails , the 120mm fan plate and also a internal ssd bracket (once i figure out where i put it )
the top two back planes were replaced with their lastest model