I like Purex Crystals for two reasons. First it is the cheapest, the Crystals cost between $2-$3 less than the competitors and then when you add this coupon it is a no brainer. The second reason is that I love the smell of the Purex, I especially like the blue bottle.

Purex Crystals: $4.76
$1.00 off Purex Crystals Print Coupon
$1/1 Purex Crystals, exp. 2/23/13 (RP 01/27/13 #2 R)
Total: $3.76