Knives
The knives that you can buy at the dollar store are not going to be the sharpest ones. They will serve their purpose on camping trips, but you should not rely on those for regular use. We promise you that it is not worth all the frustration. Just buy a good, even if pricey, one and take good care of it.

Knives
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Earbuds, Headphones
You should avoid getting tempted by headphones that you can buy for just a dollar or two. These things usually offer poor sound, so you should not better. On the bright side, it is totally possible to score a great pair for just $10 to $20. These will also last you a long time, so it is worth the investment.

Earbuds, Headphones