I was guessing; I used a $50 off, $25 off, $10 off, and $5 off on a PS4 and it shows I bought it for ~$310. Shoulda got a gift receipt.
Good news is the 25 10 and 5 coupons weren't used up. :D
I was hoping to use those coupons on a Wii U Pro controller and a wii remote plus controller. But I...