The small bags of Cascade are under $5 at most stores, which means you can actually turn this offer into a moneymaker as everyone who submits the rebate will be receiving a $5 pre-paid card.
Here is the Walmart deal on Cascade:
Cascade Platinum Action Pacs $3.97
Submit $5 Cascade Platinum pacs mail-in rebate
Final price FREE + $1.03 moneymaker!