Dollar stores don't get as much respect as they deserve. Yes, they are full to the brim with probably unlicensed toys and extremely cheap products with no craftsmanship. That said, I go to the dollar store near my house at least twice a week and it's taught me something important: There are some products we are being absolutely gouged on and we don't even know it. What's worth getting at the dollar store?
Photo by Jef Rouner They also sell miniature long distance weaponry, which is good because in the House With One F we don't tolerate melee classes
There's a great article over on Wired that breaks down the math on this, but here's the basic gist: The more a battery costs, the more energy and use you will get out of it. However, in terms of energy per cost, all batteries essentially produce the same. Now, if you're picking up big D-cells for a flashlight that you might need to always work, you should definitely spend the cash. If what you're looking for is something to power a child's toy until he or she grows bored with it, dollar store all the way.