Consider replacing all the stringers in a cub without taking off the fabric... about the same.
Last I remember it was a $30,000 deal for the kit and install.
Here is a place to check: http://www.seaplaneswest.com/floatkits.html
Buy a float plane, you will be money ahead.
Eddie get a small floatplane for that and keep the 180 for that. But if you want to explore Canada and Alaska on floats then you know now what it'll cost. Plus lots of fuel onboard.
Gary
Okay. What about putting a J-3 on floats?