Walgreen's Weekly Challenge

Walgreen's has their weekly sales ad with great deals on register rewards.  There are several websites dedicated to the $5 challenge posted every week.  Mainly using $5.00 to purchase as many items as possible at Walgreen's and then have enough RR (register rewards) to make the $5.00 challenge purchase the following week)  I have been watching the website posts and have actually started to implement this technique in my weekly shopping.  It is actually something that is useful especially to families on budgets.