Here is another amphibious robot from SuperDroid robots with WiFi functionality. It ships programmed and fully assembled. This Amphibious 4WD WiFi Robot is completely waterproof and can navigate land and water. It supports remote monitoring and surveillance with 360 pan and 90 degree tilt camera with 10x zoom.
This robot has a max payload of 25lbs. It weighs 40lbs. More info is available here.