The pre-holiday season savings event is officially kicking off on October 8 and ending on October 9, but mattresses are already as low as $218 (with over 1,000 five-star reviews ), and price cuts are as high as 51 percent off top brands like Casper, Nectar, and Purple. (Seriously, this Casper mattress is over $1,000 off right now.)

Time to stock up on some of the best Amazon Basics picks on sale now.

The Prime Big Deal Days event is on October 8 and 9, but we're already seeing mattress deals from Purple and Nectar, with up to 51 percent off.