I heard that other people have gotten them at Home Depot. If there isn't one in your area then i belive you can get them online. as for the refrigerator magnets, i saw those too but i figure they are definately to weak. your best bet is probably going to be Home Depot.
Hmm...where do you get the rare earth magnents? I tried to get them at teh craft store tonight but they only had like regular refrigerator magnents. I don't think they're strong enough to work unless I use a bunch of them.