Cinderella Episode

where jenny rides black beauty to a costume party, but on the way, they encounter some lumberjacks (or something) that need help, so jenny and beauty end up looking really dishevelled when they get to the party-- and i believe they win a prize as "cinderella after the ball".... anyway, it's my FAVORITE episode, and i can't find it on dvd/vhs.... does anyone else know where i can find it? if so-- [email protected]