Aye ... The one Roy showed you is probably the only C172 on floats you'll find.
However if you don't mind stepping up to her bigger sister and spending a couple of dollars, try
the 206 by Carenado. That really is a stunning package and at $30 dollars it really is a steal You get a couple of different models, like amphibian and cargo versions and a few with wheels (with and without pants). There are loads of repaints available for this aircraft, so you never have to be flying the same aircraft twice. I highly recommend it!
If you'd like to see more check
here and Nick Churchill made
a couple of gorgeous screenshots of the Carenado 206.