Side sleepers need a cushioning mattress topper that can soften hard beds, and I know from three years of covering the Cyber Monday sales that great bed topper deals linger...but not for long.

Last-minute deals, such as an amazing saving of up to 40% off the Casper Comfy Mattress Topper at Amazon, can vanish at any moment — so side sleepers should act fast.

I've seen plenty of mattress topper deals from brands behind the year's best mattresses (such as Helix and Birch) that are perfect for side sleepers, but there's no guarantee they'll still be discounted in the Cyber Monday mattress sales by the end of the day.

That's why I've rounded up the best mattress toppers of 2025 that are still on sale and provide plush comfort for side sleeping. We're tracking the last-chance-saloon offers in

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