Well, I hate to go back on my word so quick, but I must confess that I was too harsh. Flambeau makes something like a 'guide series' floater that is of the 'pontoon' design. They have water keels that you can snap out as well. THOSE decoys do look very good and work just like a shell. I lucked into a dozen of them at a Walmart last year. They were on sale for $25 per 4-pack. They are nice and stack easily.
The flambeaus that I will never buy again are their standard goose floaters.