There are plenty of cheap mattresses on sale at Amazon today, so if you've been waiting for Black Friday to buy a new mattress, I've found three great deals to shop right now. If you're on a tight budget you can buy a twin Zinus Green Tea Mattress for $89 at Amazon today.

For its Black Friday sale, Avocado's organic mattresses are marked down by up to 20%; 50% on bedding; and up to 10% on furniture and pillows. The company makes beds suitable for those with back pain or for chronic side sleepers because you can customize your pillow-top feel as plush, medium-firm, or firm.

If you’ve been holding out on replacing that sunken-in mattress (you know, the one you've had since college), let Black Friday be your wake-up call. This is one of the biggest shopping events of the year,