Sorry to say, im fixing my brothers Sansa Fuze now, and the only place I could find a screen was off ebay for $16! I've noticed they are not an easy part to track down. However if you search ebay, possibly craigs list, and keep at it for a little while you're sure to find someone selling another with a broken wheel, audio-in port, etc., for cheap!(or atleast cheaper than a new one)
Good Luck,
~Adam