You might want to consider selling them to the sort of folks who like to do whitewater canoeing. If they are in good condition there might be a market for them (like in the free classified ads on here). Then take the money and buy the kids a couple of Old Town Guide 147's or Mad River Adventure 14's. You can often pick those up used for $300 or less and they are good basic sturdy, decent tracking tandem canoes that will take a lot of kid abuse for knocking around lakes and small rivers.
I agree, rockered short whitewater canoes may be frustrating, depending on the kids' ages and where you intend to let them paddle. Speaking of which, where are the kids going to be paddling, out of curiosity?
URCHIN Portable Anchor
Bent Shaft Canoe Paddles
Touring Kayak Paddles
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