I didn't really need/want either of these, but I had ECBs expiring and I wanted to "roll" them so I didn't lose them.
1 Earinse - $7.99
1 Colgate - $2.99
Used a $1 coupon the Colgate, and a $10 ECB (adjusted down to $9.98). Paid $0.00 (hehe), and got back $9.99 in ECBs.