Right now, Amazon Prime members can preorder the Mario Sports Superstars 3DS Video Game for only $31.99 (20% off) with FREE shipping, since Amazon Prime members get 20% off video game preorders. Everyone else pays $39.99 (but they still get the preorder price guarantee in case the price drops).
The game will be released on 3/24/17, and the game includes the preorder price guarantee, so if the price drops before the release date, you'll pay the lowest price. Remember, if you find a better deal closer to the release date, you can always cancel your Amazon order since you're not charged until your order ships.
Be sure to check out all the Amazon deals that I've been posting for some great deals
Please note: Amazon prices tend to change quickly, so be sure to check the price before you buy.