Today only, Microsoft via eBay offers Just Dance 2017 for Xbox One for $7.99. Coupon code "PICKUPSALE" cuts that to $7.19. With free shipping, that's a buck under our mention from three days ago and the lowest in-stock price we could find now by $25.
Note: the above coupon can be used once per account, with a $75 maximum discount.
There are many ways to get cheap and even free services and goods after reaching a certain age.