This cheap bed passed our mattress expert's tests — and it's on sale for under $300

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A mattress is an important purchase. Your bed can have a major impact on the quality of your sleep at night and, in turn, your mood during the day. But just because quality matters in a mattress doesn't mean you have to go into debt to upgrade your bed. There are plenty of affordable options that hold up just as well as beds that cost hundreds, or even thousands, of dollars more. In fact...