Buy Nabisco 100 Calorie Packs between 1/1 and 1/24
Buy 3 and get $1...
Buy 4 and get $2...
Buy 5 and get $3...
...coupon off your next order

I bought the six pack boxes which are on sale for 2/$4 this week.

The 12 pack boxes are also on sale BOGO this week, but I did not try these. I guessing they are also part of the deal.