I was not aware of the moisture alarms. This sounds like really cheap insurance (about the cost of 1 or 2 square feet of floor). Don't have a Fleet Farm in the area, but I bet we can track it down. I agree with Henry and Dodgeman that ceramic or porcelein is the safest option that is architecturally appealing, but the surface is unforgiving to walk on and for dropped objects.
Dodgeman, if you find out the name of that alarm or who makes it, could you post?