Update 03-14-2010: These tapes can get pricy.  Buying three or four tapes can add up to more than the cost of the printer.  This is how I deal with it.  Order three or more online at Amazon.  Remember, these labels help you organize your life and or business and or customers and I have come to believe the value of this outweighs the cost by a long shot. White on Black is the best as I have tried Black on Clear but if the surface is dark then you can't read the label.  I have used Whit on black but the letters are not as clear - the advantage is it looks classier then the white labels.