RnZ is at
http://users.cwnet.com/zdgreg/
They make John Sullivan floats. Round on top, flat on the bottom.
You can't buy BJ floats, unless you stumble onto a set on EBAY.
The floats I make are very much like BJs, as are the floats made by Plane Fun Floats.
http://www.geocities.com/planefunfloats/