Disney recently announced the option to upgrade the free MagicBand you get when you stay at a Disney World resort or renewal your annual pass. You can still choose a free solid colour MagicBand, or you can pay to upgrade it to a "premium MagicBand". The "premium MagicBands" are a selection of character MagicBands which retail at $24.99. However, you get a $14.99 discount when you upgrade, meaning you can upgrade to a premium MagicBand for just $10.
You must take advantage of this upgrade option before you are 11 days from check-in.