The Mandalorian Limited Edition 1500 MagicBand is out early for purchase today at the Magic Kingdom at the Emporium Shop. You can also find these at Celebrity 5 & 10 and The Dark Room at Hollywood Studios. A while back I posted about new Star Wars MagicBands coming soon, and this band was originally scheduled to be released to shelves on November 12th, the same day Disney+ launches. The cost is $34.99 and the barcode SKU is 400916015622. These should be more widely available on the 12th.
If you want to order this band, you can do so by clicking this link which will take you right to the product.