Well, Do Someone want to Own These Dance Bands? Well, (*ahem* Excuse to those who lived outside UK) Amazon UK sell these for £13.50 ($16.77). And That's Not All! The same manufacturer will also release these too, A Carry-On Bag for Nintendo Switch, Just Dance Themed Silicon Case and Joy-Con Grip and Strap pack.
The Bands are helpful though for People who is tired of holding the Joy-Cons while dancing or some routines like A Little Party Never Killed Nobody or Ievan Polkka that Required Special Props to Hold or Parts that required some Hand Gestures.