Gadget Magic

Sometimes, as I wander through a store, I'll find something (usually inexpensive) that makes me say  I wish I'd thought of that!!!!  So, when it happens, I'll post my finds under the title Gadget Magic and share them with you all!  Today, I found this

What is it, you may ask?  It's Socket Splitter...  costs about $3.50 in Walmart, made by a company called Bell Automotive.  You plug the plug on the left into the cigarette lighter/utility socket in your car, and voila! Now you have two sockets to use.  I NEVER remember to charge my GPS until I'm lost and I dig it out from under the front seat where I hide it from valet parkers and car robbers.  Like, they would NEVER think of looking there... but, I digress....  As always, when I'm lost, I need the GPS AND my phone to call whomever I'm supposed to meet to tell them I'm late and lost.  This frequently involves plugging in my phone, also.  Which, until I found this, meant plugging in one and unplugging the other, back and forth!  So, for less than 4 dollars, I can have an extra thing to stick in my glove compartment for emergencies....which, may (ahem) actually be a need for GPS and an IPOD on a road trip.  C'mon, 'fess up.  Did you know such a thing exists?  AND you never told me?????   What odd little thing have you found shopping that made your life easier, simpler, or just more fun?  How much was it, and Where can I get one?