Amazon currently has : Case Logic GPSP-4 Professional GPS Case for 3.5- and 4.3-Inch GPS Navigators for just $5.33!! That is 85% off! You have to check this out, inside you can keep your charger and anything else you would need stored! It can also be used for DS, a Camera, and much more!
I bought mine with a $5.00 Amazon Gift Card from Swagbucks! And got it and I love it! It fits my charger, gps, and more inside!