If you're super frugal like I am, you'll always buy the cheapest version of everything around. While anyone loves saving a few bucks, it can be a waste of your money to buy something that doesn't perform the task the way it was meant to.
1. Windshield Wiper Fluid
I am still waiting for the $1.99 gallon of fluid I bought from Walmart to be used. Sometimes I think it would work better if I hung my head out the window and spit on the windshield. That is how crappy the fluid is.
This applies to all tape. For a prank we bought duck tape from Dollar Tree, everything we taped fell apart. Later that year I returned to the store and bought scotch tape. My calendar falls down at least twice a month because the tape just gives up.
You might as well just use your fingers to pluck your eyebrows. Generic brands are usually extremely dull.
4. Hair Ties
Cheap hair ties work for about a day until they're so stretched out your pony tail falls out within five minutes.
5. Window Cleaner
Despite what it advertises, it is usually not streak free.
6. Electronic Cases
These are almost always cheaply made. Your phone, laptop, tablet, etc, all of these are expensive. Might as well pay a little extra for a case that you know will protect your valuables.
This is for anyone who plays a woodwind instrument. Cheap reeds are easy to go through. Spending an extra couple dollars also makes the instrument sound better.
Most people don't normally have a use for clothespins but you won't either when these ones break apart.
9. Charger Cords
The regular ones are way over priced in my opinion, but these off brand ones will have a short in them probably about two weeks after you buy it.
10. Extension Cords
This is a big one. Not only are they unreliable, but they are dangerous. The wires in these cords are thinner so they are more susceptible to overheating.