For in-store pickup only, Target offers Disney Big Hero 6 SteelBook Edition on Blu-ray Disc / DVD for $19.99. That's $5 off list and the total price we could find. (For further comparison, we saw a non-SteelBook edition for $16 plus $3 for shipping two weeks ago.) It includes a steelbook game case and digital copy of the movie.
Note: Best Buy offers the Lenticular Packaging edition for the same price via in-store pickup.