What kind of bowl is this and where can I buy one? (Like at Genghis Grill)

Picture here.

Are those just custom made bowls made for Genghis Grill only? Because my Google foo comes up with nothing.

Search for a slant bowl:

http://www.google.com/search?q=slant+bowl&c2coff=1&safe=active&rls=com.microsoft:en-us&prmd=ivns&source=univ&tbm=shop&tbo=u&sa=X&ei=Moc0U7nGIoWbygHrpICwCA&ved=0CBkQsxg