Kroger has Surf Detergent on sale through 6/10. Use a $1.00/1 coupon and save on each box! Here are the details:

Surf Powder Detergent, 40 oz $2.99, sale price through 6/10
Use $1.00/1 Surf Laundry Detergent from RP 4/7 (exp 6/2)
Or $1.00/1 Surf Laundry Detergent from RP 6/2 (exp 7/14)
Final Price: $1.99