Childrens toys haven't had sides marked...

Childrens toy magnets in my area haven't has sides marked. I even went to ToysRUs.com and looked, and they didn't state whether any of the sets they have are marked as to north/soutn, or positive/negative.

I wish the online sellers of medical magnets would sell smaller units, everyone sells elaborate jewelry, expensive premade wraps, and mattress pads. A simple set of 6 or so disk magnets, with the sides marked, would be very popular.
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