The 50-cent alternative: In the March issue (page 77), I mentioned a $129 pocket-size backup power source for laptops and cell phones. Reader Jordan Krolick, a CPA in Marietta, Ga., suggests a 50-cent alternative. Carry one of those 3-in-1 electric plugs. With such a plug, you can offer to share an outlet at an airport with at least two other users using just a one-plug wall outlet. The versatile plug is also handy for use in hotel rooms with few easily accessible outlets and when you want to recharge your laptop and cell phone at the same time.