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/