There is an unadvertised Register Reward printing at Walgreens when you buy Fiber One Bars or Brownies. Combined with their current sale price, 2 for $5.00, you can get boxes for $1.75 each when you buy 4 boxes.

Catalina Information:

Buy Fiber One Chewy Bars, Fiber One 90 Calorie Chewy Bars or Fiber One 90 Calorie Brownies between 2/26-3/14

Buy 3, Receive $1.00 Catalina ($0.33 savings per item)
Buy 4, Receive $2.00 Catalina ($0.50 savings per item)
Buy 5, Receive $3.00 Catalina ($0.60 savings per item)

Fiber One Bars, 5 pack or Brownies, 6 pack 2/$5.00, On Sale thru 3/17
Buy 4, Receive $2.00 Register Reward
Use 2 $0.50/2 Fiber One Chewy Bars, 90 Calorie Chewy Bars or 90 Calorie Brownies from GM 2/5 (exp 3/31)
Or $0.50/2 Fiber One 90 Calorie Chewy Bars or 90 Calorie Brownies from SS 2/26 (exp 4/21)
Or $0.50/2 Fiber One Chewy Bars, 90 Calorie Chewy Bars or 90 Calorie Brownies from SS 2/26 (exp 4/21)
Pay $9.00, Receive $2.00 Register  Reward
Final Price: $1.75 each when you buy 4