Toys"R"Us offers Rodea the Sky Soldier for Nintendo 3DS for $9.99. Opt for in-store pickup to avoid the $5.99 shipping fee. (You can instead spend $19 or more to bag free shipping.) That's the lowest price we could find by $8.
Also available is Rodea the Sky Soldier for Nintendo Wii U for $19.99 with free shipping. That's the lowest total price we could find by $10.
In the market for any other titles? At Toys"R"Us, buy one game to get a second of equal or lesser value for 40% off. (Discount will be automatically applied in-cart.)