A new Toy Story 4 MagicBand was out on display at a media event for Toy Story 4 merchandise at Walt Disney World. This new MagicBand is on a black base color. This band is an Open Edition and has a barcode SKU of 400021269781. This price is $24.99.
This MagicBand is not available online from Disney (yet), but you can buy it from eBay online by clicking this link which will take you right to the product listings (if any are available).