The old favorite was Hippo Hands. I'd check around, looking towards snowmobile stuff. Also, look into heated handgrips. There's a bunch of options there, from permanantly mounted grips to wrap arounds that you use only when needed.
ATV handlebar covers from Ducks Unlimited, $26. Had to cut some stitches to make them big enough to fit over the bark busters but the velcro strap keeps them very secure. Work really great with heated grips.
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