One of the many things I've learned is that if you want the "money maker" items, you can't slack. And this week Keri lotion (regularly $8.29) at Walgreens was one of those coveted items so I got my ass over there Sunday morning. Allow me to explain: The lotion was on sale for $5.99, and I had a few $2 off any Keri coupons from the past week's newspapers. For buying one you received a $5 register reward, which earns you $1.01 for each one you purchase. Unfortunately (or fortunately, depending on how you look at it) you can't just clear the shelves and get a bunch of free money,…