Want to get caught up?  Read these posts first: Finances: Penny Pinching Series Pt. 1 Finances: Penny Pinching Series Pt. 2 Finances: Penny Pinching Series Pt. 3 Finances: Penny Pinching Series Pt. 4 Now that you understand in-store stacking let’s dive into online shopping stacking!  This post will focus on online shopping and how stacking…