Tools
When you have an emergency, cheap tools will do the trick. However, it’s always worth spending more money on these things. You’ll want tools that will last you for the long run and not break so easily.
Batteries
The batteries you’ll find at the dollar store will run out fast since they’re typically badly made. A lot of them don’t use modern formulations. It’s not uncommon that they’ll leak as well. When it comes to batteries, it’s better to go with reliable brand names.