From uber-Parenthackers Sara and Ben:
I was looking for a child size broom for J, but not having a lot of luck finding one that was affordable. Ben went to the grocery store, bought a cheap wisk broom with a wooden handle, cut it off at about J.'s height, and reattached the plastic topper (you could also just sand it down). It's a bit out of proportion, but we can let her help without fear of the broom handle hitting someone in the eye or knocking things off the counters.