Awhile ago somebody have asked for a place to buy a Alarm clock that works with Sansa, finally I see Buy.com carry it.
This one only supports Sansa e200 & c200 officially but it works on Fuze and View as well.
http://www.buy.com/prod/clock-radio-w-sansa-dock/q/loc/66357/206575939.html?adid=17992&dcaid=17992