Phone Chargers
You should not head into a dollar store when you see that your phone charger is about to give up on you. It might cost you more, but it is a better idea to get an original charger. With a cheap charger, your battery will suffer. On top of that, you are also going to wait more for it to charge fully. It might not be able to charge your phone all the way.
Trash Bags
You should not buy brand name trash bags at the dollar store. This deal will often just contain 2 to 3 trash bags! This is not a good deal at all, since you will go through them very quickly. On top of that, they are made poorly, which means that they will rip easily.